I have a distance to subject question. Is there a formula that says ,if I have say a 150 lens on my 4x5, and I want to do a portrait ( and say I want head and shoulders shot which is about 16 inches), other than moving the camera around and keep checking, I am sure you all know of a better way. I might be asking this wrong so forgive me. but it seems like I should be able to put something in a calculator whether I would want a 16 inch head shot, a 5 foot full body or a 100 foot bridge and atleast come close. I use a little adjustable linhoff viewer right now, and maybe that is the way for me to keep doing it but I was just wandering if you all knew a formula. thanks for all of your help and this is a great website. Rick
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