I am planning to do a series of close-ups in 4x5 (1:5 up to 1:1) and I am trying to choose a convenient focal length for my Ebony RW45. My Ebony has a spec bellows extension of 430mm, so I beleive that even with a 240, I should be able to get close to 1:1. My major concern is working distance. My only lens is a 90mm so I can't make an estimate of working distance myself. The subjects will be placed on the ground and photographed from above. With my current tripod setup, this will mean that I can work no more than 5.5 feet above the subject. Is 240 too long for 1:5 work with this setup? Alternatively, is there a formula to estimate working distance as a function of focal length and magnification?
Thanks
Jonathan
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