I've got a new Kodak Readyload holder - lastest revision "H." The end that you insert into the camera first, facing the lens, is visibly bowed. Kodak tells me that the holder is within tolerance. I am doubtful.
Clearly the way to find out is to expose some film. What I want to do is prove or disprove that when all four corners are sharp on the GG, that all four corners are sharp on film exposed using the holder. I'm going to do the same with a known good conventional two sided film holder for comparison.
Question is, how do I get the smallest possible depth of focus? Not depth of field (front of lens) but depth of focus (film plane).
I was going to pull down close on a nice flat brick wall with a 150mm Sironar-S. But something is tickling my brain... When do you get the narrowest depth of focus -- when focused at infinity, or when focused closer?
I am planning to shoot it wide open to minimize depth of field also.
Any thoughts, suggestions, comments???
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