Tagged with dof - Personal View Talks

14mm F2.5 Panasonic lens and comparison with 20mm 1.7

feha — Sun, 17 Jul 2011 10:28:31 +0000

I do own a 20mm 1.7 it's great but the AF is a bit slow ... I like DOF
Any one tested 14mm 2.5 AF ? DOF ?

My first smartphone: the world is 144p

apefos — Thu, 31 Oct 2013 08:59:32 +0000

Until some days ago my cel phone was a sony ericson w200. bar design with number buttons, very small screen... great for mp3 and fm radio due to it's own design and because battery last all day long. I also used it's voice recorder a lot... and I never thought about getting a smartphone.

With the advent of wifi dslr, mainly the D5300, I started to think about to get a smartphone to see the live view from the camera when I get one with wifi, so I started a fun research...and I found a cheap used old model with enough screen resolution... and I got it for a low price...

Problems started when I did some attempts to connect using the 3G network, as the seller promissed me it would do, but it just got connection in 2G, and then I found it was a model from other country and it would never work in 3G in my city... so I went back to the seller and got a discount... good deal!

But then this became a "happy problem". Why? Because this makes me realize lots of people are still using 2G connections around the world and youtube just enabled the 144p around 80kbps for mobile slow connections and also pc slow connections.

I saw some videos in 144p in youtube using the 2G smartphone, and it was fun... I just remember the old days when internet was analog fixed phone lines with 24Kbps speed and online videos was just a dream.

(hey you, the three halloween batmen flying around... go away!!! Let me type... LOL ps.: did you run away from an atari emulator? Mouse over you!!!)

The 144p videos are just enough in the smartphone screen to understand and get involved with the video, to imerse in the history telling... and the fun thing: no need to worry about shallow dof...240p and 144p is so small to show shallow dof...

Oh God, if online videos are your goal, yes you must care about dynamic range, resolution, shallow dof, and so on, but this 144p thing just makes me realize the old school lesson: good script and good sound: that's what really matters!!!...

There are researchs on internet (you just need to google it) that shows the average internet speed for computers around the world is 5Mbps (this is enough for youtube 1080p streaming or 720p vimeo streaming, vimeo demands more bit rate than youtube). But 5Mbps are the average speed for big cities, most people outside the big cities are still using 1Mbps or 1,5Mbps for PC connections, just enough for 360p online streaming, and here, the 3G mobile connections are 1Mbps, 500Kbps or 256Kbps, and the 2G mobile connections keeps in 30-200Kbps floating... 4G is coming, 3Gis spreading, but it takes time.

So again: there are lots of things which matters much more than the gear: good actors, good script, good misanscene... clothers, scenarios... and good script and sound. In some 144p videos from youtube I could feel the importance of good actors, because even in 144p videos bad actors are revealed and made me feel it was a so amateur production, not convincing, unpleasant to see.

I showed to a female model I worked with two videos in 6400 iso from T3i camera, one was original, other was denoised and with film grain. I asked her: did you found any difference in the image? which one was more beautiful for you? And she answered: Oh sorry I did not pay attention to this, I was watching the people talking... but as I can remember... I saw no difference... And then I started fo feel frustrated about my image quality pursuing behavior... Story telling... Why worry so much about gear? I can do the same thing with that old GX88U and PV5500 VHS combo from the early 80s...

After sometime using a smartphone I got pretty addicted to it. It is much more pleasant than a computer for internet surfing... and I believe it is better than a tablet also. I just can carry it around to any place, lightweight, and I can put it inside my pocket!!! I am very satisfied with 800x480 screen, but God... there are 1920x1080 screens in expensive smartphones! I think people who work with online videos must take into account the main device for online video viewing are smartphones and 640x360 (360p) in a 5 inch screen is the resolution and size to consider for aestetics.

Canon 7D clips topic

meniK — Fri, 06 Jan 2012 07:43:13 +0000

hey there,

here are just some of the first DSLR movies i made with a Canon 7D and a DIY-Focuslever (HoseClamp+Screw) - for anyone who has to kill some time or likes DOF... Looking forward to take some shots on a proper rig ;> solong...

best regards

A Day with Ida 2011

Untitled Project / Dexter Adaption 2011

ND filters vs high shutter in ext. shots

AlbertZ — Sat, 11 May 2013 10:53:46 +0000

I' m fond of mid-60's film with B/N , close shot and shallow DOF...every time I want to shoot something referring to this style, I generally use ND filter in ext. shots. However, yesterday I have left my ND and I was forced to shoot with my GH1 using HIGH SHUTTER and WIDE Aperture (50mm 1.7/ 2.8) with sunlight -about 5 PM, Italy is a very sunny land;)..I was struck by the results: they were closer to the 60's aesthetic than my shots with ND filter...I was wandering if high shutter was employed in cinema in the 60's...or shutter HAS ALWAYS EVER BEEN 50?

Question about FOV and DOF in relation to M43 and metabones speedbooster

andrevanberlo — Tue, 16 Apr 2013 07:11:12 +0000

I've seen a questions in the speedbooster topic and saw a similar question in a DPreview thread.

"Has anyone heard if there will be a Speed Booster for m43 LENSES on m43 bodies"

people say it can't be done because the m43 lens is built to cover a m43 sensor and this does seem logical. However (and i'm probably thinking way off here) the m43 has a cropfactor. FF does not. I always thought the FF lenses were so expensive because the entire lens has to be perfect as the entire image falls on the sensor. Where a lens designed for a cropfactor camera needs to be sharp mostly in center and not on the outside as that will not hit the sensor anyway.

So my thought was, if a GH3 has a cropfactor of about 2X, doesn't that mean that part of the total image is cropped? If so then i don't think that question for a m43-m43 speedbooster is such a strange question. As only part of the image actually hits the sensor.

So a speedbooster (i know, probably impossible) would then widen the FOV and increase DOF on m43 lenses and decrease the F-stop.

Off course there will be a lot of vignetting but still when i buy a 50mm lens for m43 that 50mm is what it would be on a full frame camera, we get a cropped version on the m43 camera but the full 50mm image has to be there for us to crop our image from.

In this video they do it the other way around: cropsensor-lens on FF camera

Could someone please explain where i'm wrong in my thinking?

Music and Art

DrDave — Mon, 24 Dec 2012 19:07:23 +0000

For my art and music show, I had been thinking for quite a while now about Robert Altman's use of extended depth of field in his movie "Prairie Home Companion." In his movie, Altman often stops the lens down to capture the ensemble feeling on the stage, sort of the opposite of using shallow DOF to highlight a soloist. So I decided to try and use this effect in the wide angle shots in this video--I used the Panasonic mini-pancake 14mm/2.5 at F4 (more was grainy). Nice to have the whole stage reasonably well in focus. Flowmotion II on lowest setting, as it was a concert and I needed the card space and reliable spanning. Unfortunately the heater blower was on during this winter show, I decided to leave most of the noise in and just roll off some of the rumble.

www.youtube.com/watch?v=bRGR4MugweE&hd=1

35mm best lens for the GH2

Alexauwa — Wed, 16 Nov 2011 16:33:15 +0000

I film on the 14-140 mm kit lense which handles shot on daylight pretty well. I am know looking for a 35 mm lens which handles night scene well and provides better DOF.

You guys have any recommendations or experience to share?

Looking forward to your reply.

Samsung Working on DSLR-like Bokeh for Compacts

Vitaliy_Kiselev — Tue, 19 Jul 2011 16:17:57 +0000

In a recently published patent application, Samsung disclosed an invention that puts shallow depth-of-field capabilities into tiny, point and shoot cameras. Samsung gets there by using dual lenses in a single camera and using that second lens in a rather novel way.
While the primary lens is capturing the full-resolution image, a secondary lens and sensor captures another image with the sole purpose of evaluating the relative distances of areas in the image. (In some configurations, the camera may actually be a 3D camera, while in other configurations, it may truly be a secondary lens and sensor.) Then, the camera merges the data with the primary image to create a depth map and applies a graduated blur based on this depth map.

Source: http://www.photographybay.com/2011/07/19/samsung-working-on-dslr-like-bokeh-for-compact-cameras/