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the number 28 300 etc is a measure of the focal length
your digital has a focal lentgh too, usually printed near the lens
so if your digital is 28 mm a 10x would be 280 mm
A normal perspective for a 35 mm is 50mm of focal length
i dont thimk you can convert focal lentgh to apprant close ness
well maybe you can but i have no idea
WHy do you need to know this? Not being a wiseguy it sounds like you are trying to do somethig trickey
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