I know that in general, image circle sizes increase with increasing f-stop. Is there a formula for this? i.e., given image-circle of size X at f-stop Y, can you guess how large the circle will be at larger f-stops?
I'm curious how large the G-Claron 305/9's image circle is at f/32, f/45, and f/64 (I know it's 381mm at f/22).
Bookmarks