From doing some diligent checking, the formula for calculating close focusing distance for a given lens and bellows is the following:
1/f = 1/d + 1/b
f = focal length
d = distance
b = bellows draw
Using this, for a 240mm lens, and 11 inches of bellows draw, the result that I come up with is a close focusing distance of 1.7 meters or roughly 5.6 feet. Somehow that sounds way too close. I hope that I'm not overlooking something here. Is this correct?
Thanks,
Ed
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