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Thread: Kowa LM8HC full coverage 8mm f1.4 on standard m43 sensor (GF1, EP1 etc)

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    Kowa LM8HC full coverage 8mm f1.4 on standard m43 sensor (GF1, EP1 etc)

    Here is the Kowa 8mm LM8HC on the Gh1 and GF1. On any of the standard m43 sensors its full coverage.
    GH1 video
    www.youtube.com/watch?v=1Q_rpI_xuoU

    GF1 pics
    https://picasaweb.google.com/anmol.m...K2Y57G7pIvKigE

    Note that the GH1 has an oversized sensor 1.86x crop. All other m43 series have a 2x crop sensor.

    On the standard sensor, part of the vignette is removed with a corner brighten mask. A very small part is still left and it can be cropped.

    Hard to obtain. I took out the rear mount and glued the Super thin C-mount adapter.
    Last edited by zcream; 11th October 2011 at 14:02.

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    Senior Member pellicle's Avatar
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    Re: Kowa LM8HC full coverage 8mm f1.4

    Hi

    tres interesting

    thanks
    Quote Originally Posted by zcream View Post
    Here is the Kowa 8mm LM8HC on the Gh1. On any of the standard m43 sensors its full coverage.

  3. #3
    Allan Ostling
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    Re: Kowa LM8HC full coverage 8mm f1.4

    Your links show images which do not cover the M43 sensor.

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    Re: Kowa LM8HC full coverage 8mm f1.4

    not too bad but yeah not full coverage unfortunately

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    Member saxshooter's Avatar
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    Re: Kowa LM8HC full coverage 8mm f1.4

    that heavy corner vignetting = not full coverage. but i'm guessing it was worse before you modified it.
    Sony NEX, Olympus m4/3 + Panasonic lenses, Leica M, and too many lenses

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    Re: Kowa LM8HC full coverage 8mm f1.4

    Thanks for that!

    The distortion at the edge of the coverage, before the vignetting, is quite marked and might be useful for some purposes, but may put some folks off.

    There seems to be a difference between the sensor coverage on still of maybe 90%, and movie of maybe 75%?

    I get ticked off by strange comments questioning my motives when I mention wide c mount lenses on another forum, so despite hundreds of posts there, I have ceased to be active. I always learn from what others post and do not find it conducive to good relations to be dismissive of the efforts of others.

    Good to see you are still seeking the grail! There are lenses capable of 1 inch sensor coverage that will cover more of the sensor. They tend to look the part though? Bulbous glass, 67mm diameter exit? Rare indeed!
    Last edited by Pat Donnelly; 11th October 2011 at 05:29. Reason: smilies dont work

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    Senior Member kds315's Avatar
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    Re: Kowa LM8HC full coverage 8mm f1.4

    Thanks for that Pat.

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    Re: Kowa LM8HC full coverage 8mm f1.4

    Gents and ladies. Its full coverage on the standard m43 sensor i.e. GF1, EP1 etc. Look at the pics taken with the GF1. Part of the corner darkening can be taken out with a brighten mask. In the end, about 3-5% is the vignette and can be cropped as needed.
    It vignettes with the GH1 as it has an oversize sensor.

    I wish there was a way to change the title to "Kowa LM8HC full coverage 8mm f1.4 on standard m43 sensor (GF1, EP1 etc)"

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    Re: Kowa LM8HC full coverage 8mm f1.4

    Quote Originally Posted by zcream View Post
    Gents and ladies. Its full coverage on the standard m43 sensor i.e. GF1, EP1 etc. Look at the pics taken with the GF1. Part of the corner darkening can be taken out with a brighten mask. In the end, about 3-5% is the vignette and can be cropped as needed.
    Sure, it's full coverage as long as you reduce the sensor size =). The vignetting on the standard m43 sensor is still an indication that you don't get full coverage regardless of what you can do in post to get rid of the corner vignetting. Maybe if you shoot in 1:1 you can say you have full coverage, but again that's a fraction of the full m43 sensor.

    Still, nice job modifying this lens!
    -Dragos
    Panasonic GH1/G1, Canon FTb(n)/F-1, Mamiya C330F/RB67 Pro SD, Chamonix 45N-2, Nikon F5 + Assorted Lenses

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    Member saxshooter's Avatar
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    Re: Kowa LM8HC full coverage 8mm f1.4 on standard m43 sensor (GF1, EP1 etc)

    should be perfect for the Nikon 1 system
    Sony NEX, Olympus m4/3 + Panasonic lenses, Leica M, and too many lenses

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