Posted Mar 26, 2012, 5:59 PM
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Join Date: Jan 2006
Location: Southwestern Ontario
Posts: 15,181
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I believe the magnification formula for stacked lenses is
magnification = focal length of primary lens / focal length of stacked lens
For this setup: 400/17 = 23.5X magnification
I recently picked up a coupling ring ($4 on ebay) so I can stack my 200mm and 50mm primes. That will give me 4X magnification but I haven't got around to using it yet. The depth of field is so shallow and focus distance so close, it will be very difficult to get usable shots of anything but stationary subjects.
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