Archived posting to the Leica Users Group, 2000/02/19

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Subject: [Leica] Vignetting
From: Mike Johnston <michaeljohnston@ameritech.net>
Date: Sat, 19 Feb 2000 09:17:37 +0000
 
>>>Can you explain why the film thicknes matters?<<<

Tom,
Not really, although I could surmise based on simple geometry. But it
does seems to matter. Very thin-emulsion films show vignetting much more
clearly. If you don't believe it, take a lens known to vignette and
shoot the same scene on Ilford 100 Delta and Tri-X. The Delta will show
more vignetting. In fact, I usually run a roll of 100 Delta as my
stardard test for vignetting when I try out a lens.

- --Mike