Cine/CCTV/Industrial lenses wider than 25mm that cover the M4/3 sensor?

Discussion in 'Adapted Lenses' started by Ian Greenhalgh, Sep 6, 2017.

  1. Ian Greenhalgh

    Ian Greenhalgh Mu-43 Regular

    40
    Sep 2, 2017
    Hi folks

    I have a large number of manual lenses shorter than 25mm, mostly C mounts, and preety much none of them cover the M4/3 sensor, some are physically too wide at the base to fit a C-M4/3 adapter so I haven't been able to try them.

    These are the ones that might reasonably have been hoped to cover but didn't, or for some other reason were a no-go:

    Zeiss Flektogon f2 12.5mm - for Pentaflex 16mm cine camera, doesn't cover M4/3
    Photosonics Ilex Cine Paragon f1.5 13mm - for Hi-G impact testing camera, doesn't cover M4/3
    Fujinon-TV f1.4 16mm C mount - for 2/3" sensor, nowhere near covers M4/3
    Fujinon-TV f1.7 17mm C mount - machine vision wide angle for 1" sensors, doesn't cover M4/3
    Fujinon-TV f1.4 25mm C mount - too wide to fit the adapter
    Computar f1.4 12.5mm C mount - for 2/3" sensor, nowhere near covers M4/3
    Cosmicar f1.4 16mm C mount - doesn't cover M4/3
    Cosmicar f1.4 25mm C mount - not tried it, will do shortly
    Vega-73 f2 20mm C mount - for the Kiev-16mm cine camera, too wide to fit the adapter

    So, what I'm wondering is, has anyone found any lenses shorter than 25mm that work on M4/3? Of course, not including ones for 35mm or APS cameras, they do work. I do have the Pentax-110 prime lenses and the 18mm and 24mm do work and produce nice results, the 50mm and 75mm also work well, if you can live with a fixed f2.8 aperture.
     
  2. barry13

    barry13 Super Moderator; Photon Wrangler Subscribing Member

    Mar 7, 2014
    Southern California
    Barry
    Hi, I was going to mention the 18mm Pentax...

    Super 16 is a bit smaller than 4/3, but frequently a C-Mount lens with Super 16 coverage will work with little or no vignetting.
    However, I am not aware of anything like that wider than 25mm.
     
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  3. Ian Greenhalgh

    Ian Greenhalgh Mu-43 Regular

    40
    Sep 2, 2017
    Hi Barry

    Judging by the response (or lack thereof) I guess you and I are not alone in not knowing anything wider than 25mm that will work, other than the little Pentax's.
     
  4. SVQuant

    SVQuant Mu-43 Hall of Famer

    Sep 20, 2015
    SF Bay Area, California, USA
    Sameer
    Paging @gnarlydog australia@gnarlydog australia as the resident adapted lens expert. He probably has all the answers.
     
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  5. Ana-Digi

    Ana-Digi Mu-43 Regular

    38
    Feb 17, 2017
    Computar 25mm F1.3 works fine for me

     
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  6. Ian Greenhalgh

    Ian Greenhalgh Mu-43 Regular

    40
    Sep 2, 2017
    Does the Computar 1.3/25 vignette at all for shooting stills?

    Today I dug out my Cosmicar 25s, I have two different versions of the 1.4/25 and a 1.8/25 and disappointingly, the 1.8/25 vignettes too much to be usable, the two 1.4s only have a slight bit of vignette but still, I don't want any vignetting.
     
  7. gnarlydog australia

    gnarlydog australia Mu-43 All-Pro Subscribing Member

    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    no expert, but I have been looking for the same thing: a small lens wider than 25mm in manual focus
    Have not found one apart from the mentioned Pentax-110 18mm
    I would not count my refitted projector lens as off-the shelf available/easy refit
     
  8. Ian Greenhalgh

    Ian Greenhalgh Mu-43 Regular

    40
    Sep 2, 2017
    Yeah, so far I've found naff all and I've got about 40 lenses 25mm and under, not counting the manual lenses for 35mm and APS-C SLRs. Only things below 25mm that do work are some lenses ripped out of digital projectors, but those are not small and don't have apertures. I think the Fujinon-TV 1.4/25 would work if it would fit into an adapter, I made a mess of mine trying to machine enough off to make it fit, so gave it to a friend who had one with bad glass so he could make one good one out of the two. I'm annoyed none of the 25mm Cosmicars covered fully as the 1.4/25 is stunning on the 1" sensor of my Nikon J1:

    Memorial-WEB. St Georges Sunset-BW-WEB.
     
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  9. Ana-Digi

    Ana-Digi Mu-43 Regular

    38
    Feb 17, 2017
    There can be sometimes a bit of vignetting, looking at the images I am not fully certain what the conditions are...

    Olympus EPL5
    35057721915_353a6e1a1b_b.
    Computar 25mm F1.3
    by Mar Yung, on Flickr

    34955126622_5e32135c8a_b.
    Computar 25mm F1.3
    by Mar Yung, on Flickr


    Here is a photo with a Fuji DX sensor:
    35210696150_c134e2c271_b. Computar 25mm F1.3 at Fuji X-M1 by Mar Yung, on Flickr
     
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  10. Ian Greenhalgh

    Ian Greenhalgh Mu-43 Regular

    40
    Sep 2, 2017
    That's very close to full coverage, I think slightly closer than the Cosmicar 1.4/25. I am told the CZJ Tevidon 25mm does cover, but that is an expensive lens, a Panny 1.7/25 would be cheaper.
     
  11. barry13

    barry13 Super Moderator; Photon Wrangler Subscribing Member

    Mar 7, 2014
    Southern California
    Barry
    Could be IBIS moving the sensor around, or possibly a loose adapter?
     
  12. gnarlydog australia

    gnarlydog australia Mu-43 All-Pro Subscribing Member

    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    my findings with lenses that barely cover the 4/3 sensor is that the vignetting is more prominent when the lens is focused to infinity
    As I move/focus the lens out for subjects that are rather close suddenly the vignetting is reduced or disappears.
     
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  13. Ian Greenhalgh

    Ian Greenhalgh Mu-43 Regular

    40
    Sep 2, 2017
    Here's a couple of boring test shots to show coverage. First is the Cosmicar 1.4/25, second is the Cosmicar 1.8/25, each at f4 with 100%crops from the centre to show sharpness. Clearly neither fully covers, the 1.4 is closer. Nothing between them in sharpness.

    P1190530. P1190530-CROP. P1190525. P1190525-CROP. .
     
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