Assuming that by doing this, I get a usable image, is there a rule of thumb/formula for using the front cell only of a LF lens in terms of a different focal length from the lenses original configuration? Does it depend on the construction of the lens? If I take the rear cell off the shutter, then focus w/the front cell to infinity, will that give me a true indicator of whatever the change in the focal length happens to be?
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