Thread: contax 21mm distagon on bmpcc metabones ef

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  1. #1 contax 21mm distagon on bmpcc metabones ef 
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    Hi, I bought the 21mm for a huge gut punch of a price convert it to leitax and the corners are soft as hell. does anyone know about this? I believe I did my conversion correct. maybe its the speedbooster? thx.
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  2. #2  
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    Out of interest have you mounted the 21mm on a Canon camera and checked for softness?
    The lens is perfectly suitable for full frame photography so should be good with the smaller sensor in your BMPCC.
    Are all 4 corners soft?
    Also can you try it with a dumb EF adapter so there is no other glass from the metabones adapter in the light path.
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  3. #3  
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    Quote Originally Posted by Nux View Post
    Out of interest have you mounted the 21mm on a Canon camera and checked for softness?
    The lens is perfectly suitable for full frame photography so should be good with the smaller sensor in your BMPCC.
    Are all 4 corners soft?
    Also can you try it with a dumb EF adapter so there is no other glass from the metabones adapter in the light path.
    It works fine on my canon dslr. When I mount it on the speed booster it just gets soft on the sides. Left and right. Not top and bottom.
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  4. #4  
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    Mine is sharp across the image on a Canon 5D mkII.

    It's sharp across the S35 image circle when used on a Metabones BMPCC Speedbooster (0.58x).

    Are you using a Metabones speedbooster or a knockoff? Maybe the back-focus needs tweaking? Or you may have to service the lens?
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  5. #5  
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    Quote Originally Posted by Steven6d View Post
    It works fine on my canon dslr. When I mount it on the speed booster it just gets soft on the sides. Left and right. Not top and bottom.
    It does sound like its possibly your speed booster...as already asked, which one is it?
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  6. #6  
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    Quote Originally Posted by Nux View Post
    It does sound like its possibly your speed booster...as already asked, which one is it?
    metabones bmpcc to ef, I'm gonna try and get a still.
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  7. #7  
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    blurryedges21mm_1.1.1.jpg

    as you can see the edges are blurry, I messed around with the infintiy adjustment but I ddint see a difference.
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  8. #8  
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    A little tricky to tell from the photo but have you tested to see how sharp the lens is with a dslr mounted on a tripod and using f8 at something detailed but flat...like a brick wall etc
    just to determine if your lens is all ok. It is most likely to be a metabones issue which might be able to be recalibrated to correct, if the glass inside is misaligned.
    But like aI say check your Contax 21mm is all good first. Good luck.
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  9. #9  
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    it was the infinity setting on the sb. all better now. thx everybody.
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  10. #10  
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    Good to hear you got it sorted.
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