C Mount Lenses for m43

balazer

It's only good in the corners when you're looking at small low resolution photos. Look at some full size photos and you'll see it's just a cheap TV lens, fine for TV formats but inappropriate for larger sensors.

ilia310101

I found a cmount lens on ebay that looks good, according to the sample pictures it looks sharp at the corners ,even on an nex camera http://www.ebay.co.uk/itm/35mm-F1-6-HD-Movie-Lens-C-to-Sony-NEX-3-5-6-7-E-mount-Adapter-Lens-Hood-/171303606237?pt=UK_Lenses_Filters_Lenses&hash=item27e27d97dd

TheLoneRoger

Answering my own question (above), I had this lens machined down and now it sits nicely in it's adapter, and whilst it wont focus to infinity wide open, it will a couple of stops down and actually it's not a bad little lens.

Another of my C mounts that I've recently re-discovered is the Canon V5x20, 20-100mm, f2.5 - parfocal, focusses to infinity, clickless aperture, decent contrast and colour for an old lens and the coolest retro-looking zoom lever ever! (see below). Yes, it vignettes a little, but I can live with that.

TheLoneRoger

Anyone know about the Cosmicar 50mm f1.8? I bought one because I have 25mm and 75mm Cosmicar lenses and really like both, but the 50 seems a little disappointing; it wont focus to infinity and has only 3 iris blades! I was wondering if it's worth getting it machined - the ring at the back looks like you could take 1, maybe 1.5 mm off it, but I'm wondering if that would be enough to get it to focus to infinity? I bought the thinnest adapter I could find, but as it stands, the lens will barely catch the thread, so ideally it needs at least 2mm taking off…

flablo

@haavard thanks for the info! Well, I have a BMPCC as well, so that would be no problem. Hope I made a bargain. Very curious about the Panasonic 4.5 f0.75. Will make some tests on GH2, GH3 and BMPCC and post them here

haavard

flablo, it should be possible. I removed a Fujinon 16-160/1.4 from a similar type of housing and it works great. I had to take out a shim from the rear and also adjust the back focus to make it focus to infinity, but it should be possible to make them work. I'm not sure what sensor size these were designed for, but try to mount them on a flat/slim c-mount adapter to see if they cover whichever camera you intended to use them with.

If they don't fit your camera, but covers S16/1", it still might be worth to take them out and sell them to someone with an Blackmagic pocket camera of the Digital Bolex.

flablo

I got crazy and bought these lenses http://cgi.ebay.it/ws/eBayISAPI.dll?ViewItem&item=171143311761 2 Fujinon Fuji CF 50B-SND-P 1:1.4/50, 1 Canon Zoom Extender 1.5X A, 1 Panasonic Aspherical TV Lens WV-LA408C3 4.5mm 1:0.75

I presume/hope it will be possible to take them out of the housing. Anyone knows if it is possible or I wasted some money? Thanks

Qadri

Just tried with video and it seems to vignette much less (slightly different sort of frame than still photo). I've only checked on the camera screen yet and it may be more apparent on bigger screen--cannot really notice it on the small screen.

Qadri

I've picked up a Pentax 25mm f1.4 c-mount for my Panasonic G6.

It is slightly vignetting on the corners. Someone has told me that this lens did vignette on their GH2 (has a slightly smaller crop) but it does not vignette on their Panasonic G6. Does anyone have any experience using this lens on the G6? I have the C22525TH but I also see there the same one with KP on the end (instead of TH). Is one a newer model and perhaps it's the older one that vignettes??

I see two versions on B&H, the TH is a lot lighter according to that (and a bit smaller) but I don't really know what's going on:

(1) http://www.bhphotovideo.com/c/product/546271-REG/Pentax_C22525KP_C22525KP_1_C_Mount.html

(2) http://www.bhphotovideo.com/c/product/418197-REG/Pentax_C22525TH_C22525TH_1_25mm_F_1_4.html

Or could it be an issue with my adapter? The lens seems to focus to infinity so adapter is good there but I don't know if the adapter could have a role in the vignette? If it does I could always try another one.

It's an excellent lens in terms of image quality (very small and light too), just that the vignetting is not appropriate for some of the videos I shoot. Thanks in advance.

inqb8tr

Does anyone know something about this lens? How much is it worth?

starios

my new tokina 12.5-75, f/1.2, 2/3inch, c-mount, rear flange dont fit in adapter so I used epoxy glue to stick c-mount screw on the lens forever without rear flange barrel. Extreme low light so noise is still here!

Nieuw

@balazer Thanks a lot for posting this! It unfortunately does not look really promising, quite soft/unequal sharpness/lack of resolving potential.... I meanwhile cheaply ordered some more of the extenders on Ebay and will see if for video they will be useable after modifying them (for fitting M4/3 C-mount adapters they must be modified, originally they are much too wide to fit, not a hard job though) and adapting them to/optimizing them for specific lenses (the C-mount is not that well defined focus wise and the teleconverter may work better on one lens than on another)......

balazer

The following images were made with the same lens, set to 30 mm and f/4.0. To compensate for the darker image from the teleconverter, I changed only the shutter speed.

Image 1 is a 16 mm crop without any teleconverter
Image 2 is a 4/3-inch crop with the Fujinon HE20-1 2x teleconverter
Image 3 is a Super 16 crop with the Fujinon HE20-1 2x teleconverter

Nieuw

@balazar I did not have a chance to seriously test the teleconverter yet because the Nikon 1 is quite crippled for that, do you think that the HE20-1 is suitable to upscale 16mm lenses to super 16 for the BMPCC? It will likely cover more sensor area than needed so the softness of the edges may be no issue here because only the 1" center is used? I know I will lose light but I would like to be able to use my relatively good quality Angenieux, Schneider and Som Berthiot 16 mm lenses on the BMPCC this way. Second, does anyone have experience with its smaller brother version HE15-1

balazer

The Fujinon HE20-1 2x teleconverter is o.k. in the center, but towards the edges it's very soft with very bad chromatic aberration.

nomad

It'll bring out any weakness in the center and loose quite some light, though.

Nieuw

@balazar, I think one could maybe use the Fujinon HE20-1 X2 converter to straighten this out..... I use it to convert 16mm lenses to super 16 1" (Nikon 1), did not test it for M4/3 though and do not know whether it covers 4/3".

nomad

I tested that very lens on a BMPCC. It covers, but even on it's far smaller sensor the corners are soft WO.

balazer

Fujinon "C" lenses are for 1-inch format single sensor cameras (16 mm image circle diameter). It will only cover the GH2 sensor in ETC mode or with 2x zoom or a 0.75x crop.

Meierhans

Got hold of Fuji C6X17.5B 1.8. No cam around. Am I a happy nerd or will image circle cross my plans? (Gh2)

Meierhans

Got hold of Fuji C6X17.5B 1.8. No cam around. Am I a happy nerd or will image circle cross my plans? (Gh2)

Nieuw

@kamil1111

kamil1111

Hello. Does anybody use Pentax 8-48 not rainbow? I think it's cosmicar. Does anybody know how to prepare it for gh2?

nomad

Same here. Even Schneider Cinegons need some shimming before being precise, those C-mount adapters are all on the shorter side to be sure to reach infinity.

balazer

A few of my zoom lenses have built-in back focus adjustments. Those lenses could be made parfocal on any C-mount adapter that would fit. The other lenses required shimming to achieve proper back focus, and shaving down the front of the mount in a couple of cases.

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