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C Mount Lenses for m43
  • 140 Replies sorted by
  • fosterchenfosterchen

    Just finished modifying my second Rainbow H6x8 II!!! Still couldn't drill precise, so again only 2 holes work...but it's still a tight locked fit! Got the version with the extra C-mount extension, so you want to unscrew that with pliers first. I believe those are specific to Datacard ID cameras that come equiped with the Rainbow zoom lens in order to take close up portrait shots for ID badges and what not.

  • fosterchenfosterchen

    I'm not sure on the DC version of this lens, but the collimator (under the rubber seal) is to set the infinity focus of the lens once you get it to mount on your GH2 or whatever camera you use (in ETC mode). Without proper calibrating, you won't be able to keep focus while zooming in and out (you want parfocal instead of varifocal).

  • jokieonejokieone

    Just testet the schneider kreautz 10 mm f 1.4 . It does not vignette

  • producerproducer

    Does anyone know or use c-mount Fujinon TV Zoom Lens 14-84mm f1.6? Any impressions? Vignetting?

  • lioneldmlioneldm

    @fosterchen I'm a noob with GH2 and a Rainbow 8-48mm (got the DC aperture version unfortunately, so I just jammed the mechanism to keep the aperture open at what I hope is f/1.5-2). Can you help me understand what the collimator is all about and how I adjust it? Also do you have any tips for C-Mount adaptors to get?

  • meemee

    I've maybe mentioned this before, but I have seen some 1 1/3inch C mount lenses, and if I am not mistaken that means 4/3rd, so wouldn't these be the best option for a 4/3rd sensor? If not, why?

  • nomadnomad

    I just tested a Kern Switar 10mm 1:1.6 with a C-mount adapter on the GH2. While this is a pretty nice lens for it's age, it doesn't make much sense on µFT. When you crop enough to get past vignetting, you are looking at a 15mm or longer. For the price these still fetch on Ebay, rather get a Panny 14mm, it has far better resolution and is only about one stop slower.

  • meemee

    It`s probably more the eye candy factor than anything, but it's 8mm 2/3 inch, and 5mp and oh so sexy http://www.bhphotovideo.com/c/product/750922-REG/Pentax_C30823KP_C30823KP_Machine_Vision_Camera.html

    anyone that can afford to test that lens will be my hero. Anyone with the skill to convert it to a cine lens could probably make a mint selling specially if it was converted to a M 4/3 mount.

  • meemee

    Has anyone used this lens? http://www.tamron.co.jp/en/data/cctv_fa/m118fm08.html The 1 1/8 inch sensor is what caught my attention. There are more with that sensor size too http://www.tamron.co.jp/en/data/cctv/h_index.html Any info on what it would take to mount these would be appreciated.

  • AlbertZAlbertZ

    It would be interesting to see some test using GF2 cameras, they have a smaller sensor ...

  • producerproducer

    Has anyone tested the model M2514-MP 25mm 1.4 2/3" lens? Any issues with GH1/2 (vignettes, tilts, etc.)?

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  • apefosapefos

  • rozrozrozroz

    these are good tests, Foster. thanks!

  • fosterchenfosterchen

    I've uploaded some more parfocal tests set to infinity focus(Outdoor setting).

    Rainbow 8-48mm:

    Rainbow 11.5-69mm:

    SLR Magic 12mm:

  • fosterchenfosterchen

    @EVILTWIN, to answer your question, that would be negative. 2/3" lenses will not cover the GH2 sensor and will need to be used in ETC mode. As mentioned, 1" lenses 25mm and higher can be used without ETC, but depending on the lens 25mm might have slight vignetting in the corners. I've tried the Canon TV16 25-100mm zoom and that vignettes slightly (plus it is not parfocal). I have a cheap Rainbow 25mm f1.4, and that does better but still vignettes.

  • EVILTWINEVILTWIN

    Will a c mount lens designed for 2/3" sensors work on a GH2 without the use of ETC mode? I was looking to buy cctv zoom lenses that might work with a GH2 without sacrificing the distance. Also looking for affordable 2/3' or 1" size zoom lenses that have decent quality without modifying for GH2.

  • rozrozrozroz

    @kazuo, i agree on the hassle involved with C-mounts on M4/3. but if someone's really in need of a fast PARFOCAL zoom, nothing can beat the price. (that is of course, if ETC is something you can live with).

    i see no need for C-mounts instead of prime lens anyway.. unless you tend to use very wide angles, so they might get pricier.

  • kazuokazuo

    @rozroz

    Notice i didn't say no more poor people for me.

    Have you tried out c mounts extensively? If you have, like me, then you would have arrived at similar conclusions, and that is, if you want proper cinematography with a GH2, you're better off using SLR lenses. My decision is informed and personal. I am not casting aspersions on anything or anyone, just learning from the blooming mistakes I made arising from bad investments in quite alot of c mount lenses.

  • rozrozrozroz

    C mounts are for the poor. what's wrong with that?

  • kazuokazuo

    haha no more c mounts for me.

  • rozrozrozroz

    @fosterchen, but did you check why your H6x8 is changing it's focal point while you zoom? did you notice that? it's very obvious when you focus on the lens in the video and zoom out, the focal point changes a bit closer to us, to the surface of the table, so the lens behind are not focused anymore. and when you zoom back into the lens they regain focus again..

  • fosterchenfosterchen

    @rozroz, I guess maybe it just felt cheap to me because it is the plastic version, and since I actually took apart the H6x8-II entirely, I feel like I know it better as a lens and all its parts.

    The S6x11 was harder to adjust the back focus, for some reason the only way i could adjust it after loosening the collimation screw was to pry the whole part back and forth with a flat head screwdriver until it seemed in focus...don't know if I have a faulty lens or I'm missing parts. Anyhow, I got it to focus, so I'm not touching that anymore!

  • rozrozrozroz

    @fosterchen-

    in the H6x8 footage it had some trouble keeping the focus. it seemed that the focal point changed place while zooming in/out.

    however, in the S6x11 s footage it looked fine.

    funny 'cause you said you didn't like the S6x11 so much. why was that?

  • berndimaxberndimax

    @jleo

    Thank you. This was the first test of the very small Xenoplan. I was surprised by the quality of that lens: sharp and very little flare when there is a strong light in the scene.

  • jleojleo

    @berndimax

    Winter in Graz, beautiful video!

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