Image circle versus stopping down?
"f/256" wrote in message
. rogers.com...
Here is an example based on the Biogon 38mm:
Assuming it has a fall off as good as Cos^3
[...]
There are ONE and a HALF stops of fall off at the corners of the film with
respect to the center of the film!!
Funny, but I don't find the 38mm Biogon that bad in real life.
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