Unrelated question.
I read an article by Spencer Cox that his Fujinon C 600 is in a Copal 3 shutter and the aperture markers go to f/64, but he takes advantage of the fact that the shutter can still be stopped down past the f/64 marking on the shutter.
My question: is there a way to confirm the apertures beyond f/64 (i.e., f/90, f1/128, etc) beyond doing it with trail and error?
I assume if I can find a logical way to determine the smaller apertures that I could use a white paint pen and mark the proper location.
Text from the article below for context:
"To be specific, with a 600mm lens, f/90 will give you as much depth of field (and diffraction) as a 45mm lens on full-frame digital at f/6.7, given the same print size. That’s not awful, but it’s not as much as I’d like. Ideally, you’d be able to stop down to at least f/180 with lenses this long, which is closer to f/13.3 equivalent. Copal shutters are usually preferable in this regard. My Fujinon C 600mm stops all the way down to f/256 in a Copal #3 (even though the shutter is only marked to f/64)." Source: https://photographylife.com/best-lenses-14x17-12x20
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