Tagged with lenses - Personal View Talks http://personal-view.com/talks/discussions/tagged/lenses/feed.rss Tue, 22 Jul 14 13:20:08 -0600 Tagged with lenses - Personal View Talks en-CA Deals: m43 lenses deals http://personal-view.com/talks/discussion/3112/deals-m43-lenses-deals Sat, 05 May 2012 10:35:04 -0600 Vitaliy_Kiselev 3112@/talks/discussions Click on the star on top right to follow this topic and not miss the deals

All actual deals reside in the end of the topic

Send me message if something is not actual.

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12mm f/2.0 Olympus M. Zuiko Digital ED Lens http://personal-view.com/talks/discussion/502/12mm-f2.0-olympus-m.-zuiko-digital-ed-lens Tue, 26 Jul 2011 14:50:42 -0600 No_SuRReNDeR 502@/talks/discussions
Available at:

* http://www.amazon.com/Olympus-Zuiko-Digital-Thirds-Cameras/dp/B0058PL9R0/
* http://www.ebay.com/sch/Lenses-/3323/i.html?_from=R40&_nkw=12mm+olympus
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Stanford and MIT Digital Photography Courses http://personal-view.com/talks/discussion/822/stanford-and-mit-digital-photography-courses Wed, 31 Aug 2011 12:50:33 -0600 Vitaliy_Kiselev 822@/talks/discussions
http://graphics.stanford.edu/courses/cs178-11/

Exposure




Variables that Affect Exposure
exposure applet screenshot


Explores the tradeoffs between aperture, exposure time and ISO.








Lens Applets




Thin Lens
thin lens applet screenshot


Uses Gauss's ray tracing construction to show how thin lenses perform a 3D perspective transformation of object space into image space.




The Gaussian Lens-Maker's Formula
gaussian applet screenshot



The relationship between object distance, image distance, and focal length, and the distinction between focusing and zooming.




Depth of Field
depth of field applet screenshot


How do focal length, subject distance, F-number, and size of the circle of confusion affect depth of field?


Telephoto Zoom Lens
zoom applet screenshot


The operation of zoom lenses, telephoto zoom lenses, and optically-compensated telephoto zoom lens.








Convolution




Spatial convolution
convolution applet screenshot


Interactively demonstrates 1D continuous convolution and 2D discrete convolution. Don't miss the "custom" buttons!








Autofocus




Autofocus: Phase Detection
autofocus: PD applet screenshot


Explore how some cameras (mostly SLRs) use phase detection to autofocus a picture.




Autofocus: Contrast Detection
autofocus: CD applet screenshot


Explore how other cameras (mostly point-and-shoots) use contrast detection to autofocus an image.








Color




Introduction to Color Theory
locus applet screenshot


Explores the trichromatic theory of color vision and
considers its implications for human perception, color photography, and computer
display of color images.




Color Matching
color matching applet screenshot


Reenact Maxwell's color matching experiment to see how closely you can match the trichromatic matching functions for the given primaries.






Chromaticity Diagrams
chromaticity diagrams applet screenshot


Explores chromaticity diagrams and the meaning of the 2D gamut of perceivable colors.




Gamut Mapping
gamut mapping applet screenshot


Interactively shows the results of gamut mapping (both the primaries and the rendering intents) on the colors displayed in an image.






Color Mixing
color mixing applet screenshot


Explores additive and subtractive color mixing.






Gamma




Gamma Correction
gamma applet screenshot


Unwrapping some of the tangled world of gamma correction.






Panoramas




Cylindrical Panoramas
projection applet screenshot


Demonstrates how images are projected from a plane to a cylinder to form a panorama.





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19mm, 30mm, 60mm F2.8 Sigma m43 primes http://personal-view.com/talks/discussion/5946/19mm-30mm-60mm-f2.8-sigma-m43-primes- Tue, 29 Jan 2013 06:05:30 -0700 itimjim 5946@/talks/discussions Hardly ground breaking, but interesting nonetheless.

http://www.sigmaphoto.com/news/sigma-announces-new-lenses-cpplus-2013

All three DN lenses incorporate telecentric optical designs and a linear, auto focusing motor that ensures accurate and quiet focusing for video recording. They also boast metal exteriors and a simply shaped focus ring, with varying textures to distinguish each part of the lens. In addition, DN users can choose between a black or silver finish to match their favorite equipment.


60mm F2.8 DN

image


Featuring the natural perspective of mid-range telephoto lenses, together with a shallow depth of field, this lens allows the photographer to capture a single part of a subject with great bokeh effects. It has an angle of view equivalent to 120mm on the Micro Four Thirds system and 90mm on the E-mount system (35mm equivalent focal length). The minimum focusing distance is 19.7 inches; the maximum magnification is 1:7.2. This lens also contains Special Low Dispersion (SLD) glass, which helps minimize axial and transverse chromatic aberration.



Sigma 19mm F2.8 DN

image


This high-performance, wide-angle telephoto lens has an angle of view equivalent to 38mm on the Micro Four Thirds system and 28.5mm on the E-mount system (35mm equivalent focal length). As a wide-angle lens with excellent mobility, it is ideal for studio photography, architecture and starry skies. Its minimum focusing distance is 7.9 inches and its maximum magnification is 1:7.4.



Sigma 30mm F2.8 DN

image


This high-performance, standard telephoto lens has an angle of view equivalent to 60mm on the Micro Four Thirds system and 45mm on the E-mount system (35mm equivalent focal length). This lens, which is perfect for casual and formal portraiture, documentary photography, travelogues and everyday shooting, includes a double-sided aspherical lens that enhances its optical performance. Its minimum focusing distance of 11.8 inches and its maximum magnification is 1:8.1.


Available at:

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C Mount Lenses for m43 http://personal-view.com/talks/discussion/1925/c-mount-lenses-for-m43 Tue, 03 Jan 2012 19:10:49 -0700 Aria 1925@/talks/discussions
I wanted to know if anyone has experience with C Mount Lenses. I was looking at some different lenses and really don't understand the difference between the CCTV, 16mm, 2/3" C Mount Lenses and if they can work with the GH1.
I also noticed that they make mention of some Lenses being 1" or 1/2". What does this mean for use with a GH1?

Could a Lens like this be used? http://www.bhphotovideo.com/c/product/341297-REG/Pentax_C60812_C60812_8mm_to_48mm.html

Photobucket]]>
Panasonics collapsible X lenses (14-42mm pancake and 45-175mm tele) http://personal-view.com/talks/discussion/746/panasonics-collapsible-x-lenses-14-42mm-pancake-and-45-175mm-tele Wed, 24 Aug 2011 01:03:57 -0600 Rambo 746@/talks/discussions
image
image
image


Info:

* Panasonic Lumix X 14-42mm Lens, price $399 or £350.
* Panasonic Lumix X 45-175mm Lens, price $449.99 or £400.

Panasonic Lumix GF3X Lens and Camera Kit, expected price <£600.<br />Availability: already abailable.
According to Panasonic the X lenses it will be fully compatible with Olympus cameras!
PowerZoom is multi-speed
It doesn’t rotate on focusing (you can use filters!)

MTF charts and Image samples of the 14-42mm X lens - http://panasonic.net/avc/lumix/systemcamera/gms/lens/g_x_vario_14_42.html.
MTF charts and Image samples of the 45-175mm X lens - http://panasonic.net/avc/lumix/systemcamera/gms/lens/g_x_vario_45_175.html .





Available at:

* US: http://www.amazon.com/Panasonic-14-42mm-F3-5-5-6-G-Series-Digital/
* US: http://www.amazon.com/Panasonic-45-175mm-F4-0-5-6-G-Series-Digital/dp/B005J5TZQ6

* UK: http://www.amazon.co.uk/Panasonic-H-PS14042E-K-F3-5-5-6-Lightweight-Standard/dp/B005K6WTSK/
* UK: http://www.amazon.co.uk/Panasonic-H-PS45175E-K-45-175mm-F4-0-5-6-Interchangeable/dp/B005JSC3H6/


Previews

New X versus old 14-42mm lens spec comparison at SLRclub.
Panasonic 14-42mm X Lens Hands-On Photos at Photographyblog.
Panasonic 45-175mm X Lens Hands-On Photos at Photographyblog.
Hot! Lens size comparison at SLRclub.
Hot! 14-42mm X lens preview at Dpreview.
Panasonic X Lens 14-42mm Hands On at ePhotozine.
Panasonic Lumix X Lens 45-175mm Hands On at ePhotozine



Press release


Photographyblog.
Engadget.
Panasonic Japan (translated in english).
Amateur Photographer.
Pocket-Lint.
Systemkameraforum (german).
Imaging Resource.

Quesabesde (spanish).

Photoscala (german).
Hot! Interview at ePhotozine.
14-42mm X at Dpreview.
45-175mm X at Dpreview.
First press release at DSLRmagazine.
Focus Numerique.


Hot Interview by ePhotozine


There may be a more lenses such as macro, more zoom, large aperture, and prime lenses in the pipeline. While we were unable to have specifics, more lenses are already in the works, and on the X lens roadmap. High quality lenses have been developed after learning Leica qualities and applying them to their own designs, and by using software correction they are able to correct any distortion caused by the more compact lenses. This will mean that the distortion will / may show on RAW images, and that Panasonic will need to update RAW support for these new lenses.

He also said that the GH3 is not due imminently, as the GH2 is still extremely popular, but that there is a high end GF series camera in the works.”




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50-135mm wide aperture lens http://personal-view.com/talks/discussion/5495/50-135mm-wide-aperture-lens- Sat, 15 Dec 2012 12:47:00 -0700 Sph1nxster 5495@/talks/discussions Anybody have any recommendations for a lens between 50-135mm with wide aperture?

All the panasonic zoom lenses have a lowest f setting of 4.0 (can't afford 35-100 x lens!!)

Looking for something that wont break the bank and a well made converter that wont break!

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Wanted: Hire SLR Magic Anamorphot - UK http://personal-view.com/talks/discussion/10546/wanted-hire-slr-magic-anamorphot-uk Thu, 05 Jun 2014 04:38:53 -0600 nobbystylus 10546@/talks/discussions Hello, i'm shooting and directing a music film over the next two months and i'm really keen to try out the SLR MAGIC Anamorphot (for use with my GH4 / GH2) to see if it will work for the piece. I'd love to hire it over a weekend to test it out. I'm fully insured and will cover transport in the UK. Anybody own this in the UK and would be happy to hire it out to me for a weekend?

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Samyang/Rokinon cine lenses http://personal-view.com/talks/discussion/4029/samyangrokinon-cine-lenses Tue, 24 Jul 2012 19:28:27 -0600 Vitaliy_Kiselev 4029@/talks/discussions Rokinon 35mm T1.5 cine lens will be available in U.S in few weeks and Rokinon 24mm T1.5 & 14mm T3.1 cine lens will be available in U.S in September.

Available at:

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12-35mm F2.8 Panasonic lens topic http://personal-view.com/talks/discussion/3283/12-35mm-f2.8-panasonic-lens-topic Sun, 20 May 2012 20:41:13 -0600 Vitaliy_Kiselev 3283@/talks/discussions image



Price: $1299, 1100 Euro, 999 pounds

Avilable at:

Press release:

http://www.photographyblog.com/news/panasonic_lumix_g_x_vario_12-35mm/

Previews and reviews:

Samples:

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Which mount is this Zeiss Tessar 40mm pancake? (Photos included) http://personal-view.com/talks/discussion/10130/which-mount-is-this-zeiss-tessar-40mm-pancake-photos-included Thu, 10 Apr 2014 03:30:48 -0600 fatpig 10130@/talks/discussions Hello guys,

can anyone of you tell me, which mount this is? Thanks to you in advance!

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Dog Schidt Lenses http://personal-view.com/talks/discussion/8375/dog-schidt-lenses Tue, 08 Oct 2013 15:58:59 -0600 shian 8375@/talks/discussions So over at a friend's house borrowing some lenses and he asked me If I had used any dogshit lenses lately. I laughed and said, "I really try not to ever use any", and then he showed me what he was talking about. The name alone made me laugh, but the results are kinda awesome, and I like what these guys are doing. For Cameras with shallow DR, these are amazing lenses.

I just love that their contrast options are "Low, Lower, and Stupidly Low."

http://dogschidtoptiks.co.uk/index.html

image

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Lenses for Canon FD mount http://personal-view.com/talks/discussion/106/lenses-for-canon-fd-mount Wed, 18 May 2011 11:47:09 -0600 Vitaliy_Kiselev 106@/talks/discussions
Why Canon FD? You can find many great lenses for this mount.
And thanks to the fact that this mount is completely abandoned, they can be obtained for cheaper price, normally.

I'll start from the most frequently mentioned lens - Canon FD 40mm F1.4. It had many versions.
I really do not know all the differencies, but they are not very important as far as I am aware.

image

While it is not very sharp wide open, but it is well build. Focus is smooth and handy.]]>
35-100mm Panasonic vintage lens alternative http://personal-view.com/talks/discussion/6972/35-100mm-panasonic-vintage-lens-alternative Wed, 15 May 2013 05:57:02 -0600 Sph1nxster 6972@/talks/discussions Looking for suggestions for a cheaper alternative to the 35-100 X lens from Panasonic.

So far I have looked at the 35-105 3:5 Canon FD, which is pretty close.

Is there anything better than this in any other mount?

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Hidden gems among lenses http://personal-view.com/talks/discussion/80/hidden-gems-among-lenses Thu, 12 May 2011 00:39:39 -0600 Vitaliy_Kiselev 80@/talks/discussions
First one - Vivitar 28-200mm F3.5-5.3

1) Buy only original 28-200mm as in picture below. Tokina is absolutely different lens with different optical formula (look at crop from Vivitar box, Tokina have fewer elements).
2) For Pentax, lens could come either in PK/A or PK A/R mounts. In former you must remoive Ricoh pin. On both you must use file to remove excessive lever protection.
3) Closed down, lens is PP friend. Good wide open, but as on many old lenses have some abberations. Contrast is lower due to many glass surfaces and not top-notch coatings. Abberations are almost absent if close down (see below).
4) Corners are controlled quite well.




Available at:

http://www.ebay.com/sch/i.html?_trksid=m570.l3201&_nkw=Vivitar+28-200mm+&_sacat=0

Some links:

http://forums.dpreview.com/forums/read.asp?forum=1036&message=27092473




Lens and box photos:

image

image

image

image





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WTB: certain c/y zeiss glass http://personal-view.com/talks/discussion/8620/wtb-certain-cy-zeiss-glass Thu, 31 Oct 2013 15:21:07 -0600 RRRR 8620@/talks/discussions Now, there´s certainly no rush here on my part right now but I´m looking to expand my c/y kit and I don´t want to bother with ebay. Optics need to be in really good condition but other than that I can be flexible, depending on the deal. If you have a snug fit c/y - ef adapter you need rid of, that too might be of interest... Hence, if you have any of the following / consider selling – please let me know (asking price also):

Primes:

18mm f4 distagon

21mm f2.8 distagon

35mm f1.4 distagon

100mm makro-planar

+long teles might also be of interest.

Zoom:

33-135mm f3.3-f4.5 vario-sonnar

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"Cheap" Leica R lenses http://personal-view.com/talks/discussion/119/cheap-leica-r-lenses Fri, 20 May 2011 18:04:10 -0600 andres 119@/talks/discussions I'll make this mainly about Leica R lenses that are discontinued because Leica doesn't make Reflex cameras any more. One good thing about this lenses is their focal flange distance of 47 mm, therefore it can be adapted to Nikon, pentax, canon, or any other mount. So if lenses are the real investment because they last longer than cameras then it makes some sense to buy lenses that can fit any camera system. (Maybe Nikon makes a dslr that shoots raw). This is no 30 euro lens thread but if you know what and where to look then you could find a lot of sub 200 euro lenses.
What I find good about this lenses: excellent color reproduction long focus barrel rotation and they practically don't breath when focusing.

So lets start with the Leica nomenclature for f stops
(There are plenty more but this are the most common)
f/stop Name
f/0.95, f/1 and f/1.2 NOCTILUX
f/1.4 SUMMILUX
f/2 SUMMICRON
f/2.5 SUMMARIT
f/2.8 ELMARIT
f/3.5, f/3.8 and f/4 ELMAR, SUPER-ELMAR

So when you see a Leica lens you must see the name and the serial number.
Serial numbers are very important because they tell you the production year and the model of the lens.

This French site tells you in which year a lens was made
http://summilux.net/numeros/

Then here you can see which model the lens is
http://www.overgaard.dk/leica_lens_compendium.html
(scroll down to: “R-lenses for R3, R4, R6, R6.2, R7, R8, R9”)

Here you can see which lenses work with canon 5D without hitting the mirror
http://www.pebbleplace.com/Personal/Leica_db.html

This is good to know because then you can see when a lens is over priced or not.
For example a 3900000 Summicron 90 costs 2900 euros while a 2800000 costs 500 and a 90 Elmarit 2100000 is 250 euros. Of course prices vary depending on the condition of the lens. I bought a 90 Elmarit with dust inside for 170 euros.

So the idea is to find a good leicas really cheap, there are old leica lenses that don't work on new leica R cameras. Those sometimes are labeled as SL/SL2 or Leicaflex (those are the first slr cameras leica made.) With patience you can find a 1st model Summicron 50 for 125-200 euros; the Elmarit 135 for 170-250 euros.

Now an intresting story is the leica 24mm. Leica didn't have good wide angle lenses in the 70 and no zooms. They really liked minolta's stuff so the 24mm is actually a minolta lens, the same happens with the 16mm fisheye and the 35-70 f3,5 zoom. 70-210mmf4, 75-200 f4.5 and 80-200 f4.5 all minolta made.
With the m43 those minolta lenses are a huge deal I think way better than the fd's. The 58mm f1.2 is one of the best f1,2 ever made, and the zooms can be found dirt cheap and has the same optics as the leica.(the good versions) ]]>
1/2-inch ENG zoom lenses and mounting solutions http://personal-view.com/talks/discussion/5862/12-inch-eng-zoom-lenses-and-mounting-solutions Mon, 21 Jan 2013 21:08:50 -0700 balazer 5862@/talks/discussions The 1/2-inch format has an image circle diameter of 8 mm, which is very close to the GH2's 1080 ETC-mode diagonal of 8.3 mm.

1/2-inch format ENG lenses are made for 3-CCD cameras. The standard specifies an amount of glass behind the lens for the prism and color filters. It also specifies slightly different flange focal distances for green than for red and for blue. Since the GH2 has no prism and has its color sensors all in the same plane, these lenses are not perfectly matched for the GH2. In my testing, at wide aperture settings the image becomes hazy due to some focus aberration - I'm guessing mostly because of the absence of glass behind the lens. Stopping down to f/4 or so mostly fixes the haziness. In theory, the lack of glass behind the lens could be corrected with nothing more than a flat block of glass between the lens and the sensor. It would take more complicated optics to correct for the differences in the flange focal distances of the different colors, but I don't expect the longitudinal chromatic aberration to be very bad if this weren't corrected.

There are two 1/2-inch mounts: standard, and Sony. Most 1/2-inch lens models were made in both mounts. About two thirds of the used lenses for sale are in standard mount, and one third in Sony mount. I have attached sample images of the different mounts. The standard mount has a flange focal distance of 35.74 mm. The Sony mount has a flange focal distance of 38 mm.

ciecio7 on eBay makes a 1/2-inch Sony mount to Micro Four Thirds adapter: http://en.foto-akcesoria.com.pl/index.php/shop/product?idproduct=321&productname=1-2-quot-38-mount-mft

He also had a 1/2-inch standard mount to Micro Four Thirds adapter listed for sale, but I ordered the adapter and it was wrong. I'm sending my adapter back, but I'm sure someone could work with him to get him the proper specifications for a 1/2-inch standard mount adapter. The 1/2-inch standard mount is quite similar to the 2/3-inch B4 mount, except with a different flange focal distance. He already makes 2/3-inch B4 mount adapters.

Canon 1/2-inch ENG lens models:

  • KH: portable high def
  • H: portable
  • PH: studio/field
  • YH: portable pro standard def and pre-HD (semi-pro)

  • SX or SY in the servo unit model number indicates a Sony interface. IX, HX, or BX indicates a standard interface.

Fujinon 1/2-inch ENG lens models:

  • HS: premiere series high def, standard mount
  • HSs: premiere series high def, Sony mount
  • ZS: high def, standard mount
  • XS: high def, Sony mount
  • S: standard def and pre-HD

  • -38, -D38, -18, or -D18 suffix in the servo unit model number indicates a Sony interfaces. Suffixes with other numbers usually indicate a standard interface.

Standard definition lenses in most cases are more than capable of delivering HD resolutions, though not necessarily across the entire frame and at all focal lengths and aperture settings. HD lenses are made to a higher standard, and they cost a lot more.

References:

http://www.cinematography.net/edited-pages/HDLensesOnFilmCameras.htm

http://tech.ebu.ch/docs/tech/tech3294.pdf

http://www.usa.canon.com/CUSA/assets/app/pdf/whitepaper/bctv/2.3InTriImager08.pdf

http://www.usa.canon.com/CUSA/assets/app/pdf/bctv/CanonMarch06WhitePaper.pdf

http://www.usa.canon.com/CUSA/assets/app/pdf/bctv/Whitepaper_Revised.pdf

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What GH2 lens setup should I go with? http://personal-view.com/talks/discussion/9687/what-gh2-lens-setup-should-i-go-with Fri, 21 Feb 2014 22:16:51 -0700 regaliafilms 9687@/talks/discussions Hey, so I've had a GH2 for a bit now, and I'm in need of some nice lenses, I did some research and I came up with two different lens setups. Can't decide which one I should pick so if the community here could help me it would be very wonderful.

SETUP 1: Panasonic LUMIX G 20mm f/1.7, Sigma 30mm f/1.4, Canon EF 50mm f/1.8 II

SETUP 2: Tokina 11-16mm f/2.8, Nikon 28mm f/2.8D AF Nikkor , Nikon 50mm f/1.4D AF Nikkor Lens

I'm going to be filming for the most part, short films, and I want lenses that will give me a nice cinematic feel? (can't find the right word to use here) But, just want to get your guys' opinions on these setups and what you guys think I should do. I am on a budget here so if you are going to make other suggestions for setups please try to keep it below $850. Thanks!

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What camera/ lenses for action http://personal-view.com/talks/discussion/9632/what-camera-lenses-for-action Sat, 15 Feb 2014 16:07:36 -0700 Duly_noted 9632@/talks/discussions I am a stuntman and free runner looking for a good camera for video and some stills. I have never used a dslr or M43 for any great length of time. I need 1080 p and 60 fps for slow motion. In my price range I'm looking at the Panasonic G6 or the new Nikon D3300. I'm having trouble deciding and was wondering if anyone with the G6 has experience shooting sports video with it. Also what glass would you recommend? Most shots will be during the day in Texas sun. At least one with shallow depth of field for some artistic shots and a wide angle. Should I get the kit on Amazon with the 14-42mm and add from there? I saw some people recommending cannon lenses, cheap but good I think. Which camera do you think would have better video quality in 60 fps? I know that can effect editing with plugins like twixtor.

Thank you for your time, responses, and patience, I am a noob now but hope to be good at this eventually.

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Lenses to use with GH4 / 4K Cameras http://personal-view.com/talks/discussion/9575/lenses-to-use-with-gh4-4k-cameras Sun, 09 Feb 2014 13:37:30 -0700 JanH 9575@/talks/discussions I'm pretty excited about the potential of the GH4 (and I suppose any other 4K cameras at $2,000 or so). I am currently using the GH13, mainly in 720p mode with a variety of legacy full frame lenses. Canon FD, Minolta MD, Nikon, Helios, Pentax etc. These all produce a lovely image, less clinical than the Panasonic 14-140 kit lens, IMHO.

Now with 4k coming along, I'm wondering if these older lenses will have any chance of producing the detailed images that the higher resolution sensors are capable of. Or, whether the way forward would be to use an RJ or Metabones speed booster with these lenses to get the detail/ resolution? It would be a shame to not be able to get the benefits of 4k unless using m43 lenses.

Does anyone have any experience, or opinions on this subject? I'd appreciate any comments.

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B4 lenses and mounting solutions http://personal-view.com/talks/discussion/412/b4-lenses-and-mounting-solutions Sun, 17 Jul 2011 20:36:45 -0600 qwerty123 412@/talks/discussions Canon lenses

image

Fujinon lenses

image

----------------

The only adapter I've seen is this one: http://bit.ly/obeiGG

Looks nice, but it costs $320!!!!! (seems very over-priced)

Anyone know of alternatives?

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Video-Friendly Lenses for Lumix DSLRs http://personal-view.com/talks/discussion/859/video-friendly-lenses-for-lumix-dslrs Mon, 05 Sep 2011 14:46:59 -0600 LPowell 859@/talks/discussions

* Stabilization and control of camera movement
* Matte box shading of camera lens
* Direct, tactile control of lens aperture
* Follow focus control of lens focus


Lenses that adapt well to these requirements will possess a combination of subtle features that are often omitted from manufacturers' data sheets and overlooked in published reviews. While vintage lenses provide full manual controls, their compact, old-school design often makes them unsuitable for use on a rig. At the other extreme, modern trends in auto-focus lens design have eliminated a number of manual lens features that remain essential to videographers. In many cases, the most usable lenses for video come from early generations of auto-focus lenses that combined vintage manual controls with modern lens design.

Here's my list of features that make a lens video-friendly:


* Manual aperture ring
* Direct-coupled focus ring
* Proper focus ring rotation
* Non-rotating outer barrel (internal focus)
* Non-extending outer barrel (internal zoom/focus)
* Constant field of view
* Constant f-stop aperture
* Rotational zoom ring


While few lenses possess all the above features, a good video lens will make up for any deficiencies with solid performance in other aspects.

* Manual aperture ring

Lenses that lack a manual aperture ring are problematic for video.

Vintage manual-focus lenses all have manual aperture rings, and most can be set to an auto-iris mode for in-camera control of aperture in shutter-priority mode. Many auto-focus lenses have eliminated the manual aperture ring, relying entirely on camera controls to set aperture in manual mode. This includes all Lumix, Zuiko Digital, Canon EOS, and Nikon G-type auto-focus lenses, as well as most currently manufactured lenses by Tokina, Tamron, and Sigma.


* Direct-coupled focus ring

Lenses with an electronic focus ring are problematic for video.

While all auto-focus lenses can be manually focused, not all of them are truly manual. The focus rings on Lumix, Zuiko Digital, and many Sigma HSM lenses are not directly coupled to the lens' internal focusing mechanisms. As a result, their focus rings continue to rotate uselessly beyond max and min focus limits. Lenses like this cannot be used on rigs with follow focus attachments, since focus ring position is completely uncalibrated.


* Proper focus ring rotation

Lenses with contrary focus ring rotation are problematic for video.

When mounted on a rig with a follow focus attachment, the focus ring rotation of the lens will determine the rotation direction of the follow focus wheel. Regardless of which side of the lens the FF wheel is mounted on, it's important that focus-pulling direction be consistent among all lenses used on the rig.

With Lumix, Zuiko, EOS, and Sigma lenses, infinity focus is at the counter-clockwise end of focus ring rotation. With Nikon and Pentax lenses, infinity focus is at the clockwise end of focus ring rotation. Tokina, Tamron, and Samyang/Rokinon lenses are usually built with the appropriate focus ring rotation for each type of lens mount. Sigma lenses, however, always rotate in the Lumix direction, regardless of the lens mount. For follow focus use, I prefer lenses that rotate in the Nikon direction because it pulls focus closer as I rotate the FF wheel toward me.


* Non-extending outer barrel

Lenses with an extending outer barrel are problematic for video.

Most zoom lenses, both manual and auto-focus, are designed with outer lens barrels that extend when the lens is zoomed and/or focused. While the barrels on most vintage prime lenses do not rotate, they usually extend when focused. A lens whose length changes can be awkward to use on a rig with a matte box.


* Non-rotating outer barrel

Lenses with a rotating outer barrel are problematic for video.

Most vintage zoom lenses are built with the focus ring on the outer lens barrel. This causes any attached lens filter to rotate as the lens is focused, making these lenses unsuitable for use with polarizer and anamorphic attachments. Most modern auto-focus lenses use internal focusing mechanisms that avoid these issues.


* Constant field of view

Lenses that breathe noticeably while focusing are problematic for video.

The focal length of almost all lenses will change slightly as the lens is focused. This effect, known as "lens breathing", alters the framing of a shot when pulling focus, making the lens appear to zoom as well as shift focus. This can ruin a shot if it is noticeable enough to be distracting.


* Constant f-stop aperture

Lenses with variable f-stops are problematic for video.

On many zoom lenses, the actual aperture will vary when the lens is set at its widest f-stops. This will cause zooming at wide f-stops to visibly affect exposure settings, which can ruin a video clip.


* Rotational zoom ring

Lenses with push-pull zoom rings are problematic for video.

Virtually all modern zoom lenses use individual focus and zoom rings. Many vintage zoom lenses were designed with a combined zoom/focus ring which zooms by sliding along the length of the lens barrel. Lenses like this are usually impractical to use on rigs with follow focus attachments.


In the next post I've reviewed a list of video-friendly manual-focus lenses that I've found well-suited for use with Lumix DSLRs. In addition, you can find a list of auto-focus zoom lenses for Lumix DSLRs at the following link:

http://www.personal-view.com./talks/discussion/859/video-friendly-lenses-for-lumix-dslrs/p5]]>
Lens Locker http://personal-view.com/talks/discussion/8986/lens-locker Fri, 06 Dec 2013 04:43:42 -0700 andyharris 8986@/talks/discussions A friend of mine pointed me at:

Link removed

I've just hired a 45mm TSE lens for 48hrs, it cost me about £52 including the return postage. The 48hrs didn't include the delivery and return day. They box up the lens in a plastic tupperware style box and a very soft lens bag. The service seems quite pleasant.

Not used a TSE before, here are my experiments:

http://www.flickr.com/photos/63040616@N03/sets/72157638357671044/

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Fisheye for GH2 : Rokinon 7.5mm f3.5 OR Rokinon 8mm f2.8 with adapter ? http://personal-view.com/talks/discussion/8798/fisheye-for-gh2-rokinon-7.5mm-f3.5-or-rokinon-8mm-f2.8-with-adapter- Sun, 17 Nov 2013 04:41:27 -0700 TruHype 8798@/talks/discussions Hello everyone,

I just recently wanted to buy a fisheye lens to filming skateboard videos, but I came across 2 different fisheyes :

  • The Rokinon 7.5mm f3.5 for Micro 4/3

Or

  • The Rokinon 8mm f2.8 for Sony E-mount (NEX-7, NEX-5, NEX-3...) + Adapter

The thing is I know the Rokinon for M4/3 is going to fit directly on my camera (tried it in a shop), but the Rokinon for Sony is much faster, but maybe a little less wide...

Can you please help me choose ?

Thank you.

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Which CCTV lens for wide angle fisheye use ? http://personal-view.com/talks/discussion/7609/which-cctv-lens-for-wide-angle-fisheye-use- Fri, 26 Jul 2013 05:31:26 -0600 TruHype 7609@/talks/discussions Hello everyone,

I've recently started to get interested in C mount (CCTV) lens, for they are fast, wide, and cheap. So I wondered, is there any CCTV lens that I could use as a Fisheye (and get the same effect as the Panasonic 8mm f3.5, but faster) ? Here's a few lens I've found looking on the internet :

  • Rainbow 3.5mm 1.6

  • Tamron 4-12mm 1.2

  • Pentax 6mm 1.2 (+ wide conversion lens x0.45)

Wanted effect :

The GH2 exact m4/3 sensor crop is x1.86.

So I would like to get the same widness as the Panasonic 8mm or any 8mm Fisheye (Samyang, Peleng, Rokinon...) :

Panasonic 8mm : 8 x 1.86 = 14.88mm equivalent (no need for ETC mode)

Rainbow 3.5mm : 3.5 x 1.86 = 6.51 -> 6.51 x 2 = 13mm equivalent

Pentax 6mm : 6 x 1.86 = 11.16 -> 11.6 x 2 = 23.2mm equivalent -> 23.2 x 0.45 = 10.44mm equivalent

x 1.86 : GH2 Sensor Crop

x 2 : ETC tele conversion mode crop (to cover vignetting)

x 0.45 : Wide convversion lens

Does that mean we could use any CCTV c mount lens instead of the Panasonic lens to get the wide fisheye effect ?

A few videos :

Lenses :

C mount lens (1/2") work well on the GH2, but I heard that the CS mount lens (1/3") would still have really heavy vignetting because even with the ETC mode it would not cover entirely the GH2 sensor. Is that true ?

Interesting CS mount lens, but 1/3 inch : http://www.ebay.fr/itm/TAMRON-Manual-Iris-CCTV-Lens-3-0-8mm-1-1-0-ASPHERICAL-C-Mount-3-Mega-Pixel-/261248954560?pt=UK_CCTV&hash=item3cd3a6b0c0

I would use the fisheye to film Skateboarding.

Thank you.

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Manual lens rebuilding http://personal-view.com/talks/discussion/43/manual-lens-rebuilding Mon, 02 May 2011 15:53:54 -0600 svart 43@/talks/discussions
Rebuilding/cleaning lenses is not a simple thing to do. The work is physically easy but any small slip up can render the lens unusable. Also, in most lenses if you take the helicals apart and then attempt to put them back together later, the helicals will line up a hundred different ways but only one way will be right. IF you take the helicals apart, be VERY sure that you have marked them somehow or you'll be in for a hard time.

I have been building up a set of manual nikon lenses, primarily AI series lenses. I've been buying cheap lenses that usually have stuck focuses since this is really an easy way to get lenses for less than premium price, as long as you can work on them. This isn't without potential issues as a lot of sellers will tell you the obvious problems but either won't know all of the details or they just won't tell you all the details. Some lenses have even been taken apart previously and put together wrong.. In short, there might be more problems with these lenses than you know about, so be prepared.

Anyway, I can't go into detail about how to rebuild a lens since each lens is different and might need different work done but I can share some of the issues I had.

One of the issues was re-greasing the lens helicals. Tons of websites and forums claim to have the magic formulas for helical grease or they'll tell you that some strange brand works the best. Some sell you tiny little amounts of grease for lots of money while others mention greases that haven't been available for decades.

I've tried a lot of different greases and here's what I found:

Forget any organic grease.

Anything marked NLGI 2 is going to be too thick. This includes pretty much any of the "bicycle" or automobile greases that are touted on a lot of lens websites. They make the lenses feel solid but focusing takes considerable force which may cause the lens to "bob" back and forth while focusing(also known as lens breathing) and/or shift in the mounts. Both of which ruin shots.

NLGI 1 is better but some of the greases are sticky while some are more jelly-like and offer very little metal-to-metal protection. Most of these are made to grease plastic gears or O-rings. A lot of these greases are PAO based oils with thickeners to make them more grease-like.

PAOs are the base chemicals for synthetic oils like Mobil 1 automobile oils. They tend to stick to metals pretty well and they never separate under heat and pressure like organic oils.

Many of the websites I read said nothing about using oils and the few that did said never to use oils. They never specified what kind or even if they had tried it. I found that synthetic motor oil felt the best and offered the most metal-to-metal protection in the helicals. I even performed a test where I heated the lens helicals up to see if the oil would run out. It did not, generally because synthetic oils actually thicken up slightly when heated.

I wanted a PAO based oil with a sticky property that had PTFE(teflon). I found Super Lube 51004. It's a high viscosity PAO based oil with PTFE. a few small dabs of oil on the helicals and the lenses move smoothly and easily with no "whispering" that you get with metal/metal contact. Just don't use too much, a small amount is all that is needed.


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Voigtlander 58mm f1.4 Nokton for GH2 Video http://personal-view.com/talks/discussion/7448/voigtlander-58mm-f1.4-nokton-for-gh2-video Sun, 07 Jul 2013 07:40:11 -0600 Matthew_Lawrence 7448@/talks/discussions Hi,

I'm looking to get the Voigtlander 58mm f1.4 Nokton (Nikon Mount) and adapter to use with my Voigtlander 25mm f0.95 on my GH2. I primarily shoot video.

When researching this lens I've come across a lot of talk about the lens overexposing by 2/3 f-stops and a few people are saying it's the chip that causes this. Am I correct in thinking that this don't be a problem for me on the GH2 as with a the camera wouldn't be able to meter the lens anyway?

Any advice greatly appreciated.

Many Thanks, Matthew

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M4/3 Adapters for sale http://personal-view.com/talks/discussion/7346/m43-adapters-for-sale Tue, 25 Jun 2013 08:20:09 -0600 sicovdplas 7346@/talks/discussions For sale 5 m4/3 adapters.

Looking to sell them in 1 package for 85 euro. Fotasy Konica -> m4/3 m42 -> m4/3 canon fd -> m4/3 (ciec70 adapter) Olympus om -> m4/3 Nikon -> m4/3

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Best wide lenses http://personal-view.com/talks/discussion/40/best-wide-lenses- Mon, 02 May 2011 11:36:48 -0600 Vitaliy_Kiselev 40@/talks/discussions
m43 lenses

image
Panasonic 7-14mm F4 - about $1000
Very sharp, highly recommended lens. Not fast.

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Panasonic 14mm F2.5 - about $350
Also not very fast for prime lens. Sharpness is average, corners are quite soft wide open.

image
Tokina 11-16mm F2.8 - about $700
Very highly regarded lens. Good compliment to longer 2.8 zoom.

image
Samyang 14mm F2.8 - about $400
Very sharp, quite large lens. Has quite complex distortion, unfortunately.

Canon lenses

image
Tokina 11-16mm F2.8 - about $700
Very highly regarded lens. Good compliment to longer 2.8 zoom.

image
Samyang 14mm F2.8 - about $400
Very sharp, quite large lens. Has quite complex distortion, unfortunately.
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