Which 6 bit code to use for a Zeiss Biogon 21 f4.5 ZM to pair it on a Leica M8/M8.2

[jaapv]

Advertisement (gone after registration)

Yes, flat field correction has always been a far better solution than fiddling with lens profiles that are meant for a number of Leica  lenses but not meant for other brands or unsupported lenses. 

[antonio-p]

2 hours ago, jaapv said:

So just use flat field correction. Leica lens profiles will never be a perfect solution for non-Leica lenses. 

 

Procedure:

Shoot your profiles. Take your sheet of Yupo paper, hold it right in front of the lens (the easiest way is to sandwich the paper between your lens and the glass of a window). Pick your reference distances. We used 1m, 2m, 5m and ∞, but you could also choose your favorite hyperfocal distance. Shoot a test at one f/stop, all distances. Then switch to the next f/stop, all distances.

The Yupo is used only as a diffuser for a light source the lens is contacting. The lens rests against the Yupo, and what changes is the focused distance of the lens (because lens-to-sensor distance is what matters). So whether the lens is set to 1m, 5m, or ∞, the front rim of the lens is always in contact with the Yupo (or very, very close).

then follow this video to see how to use flat fields in Lightroom classic

 

 

and these other links for further explanations on specifics in the use of flat field

 

  https://themachineplanet.wordpress.com/2014/04/20/zeiss-c-biogon-t-4521-zm-and-removing-the-reds/

  https://youtu.be/G7oaLJhXRGs?si=FsWvSuEOTmctDo6S
    

  

 

 

[jaapv]

I used an overcast sky and normal printing paper worked perfectly. You can also use an Expodisk. 
Reid Reviews is a subscription website and may not be quoted directly.