Quote:
Originally Posted by Atmos
For a while I have been considering doing some super macro work. True macro lens' are 1:1 at their closest focus point but I was wondering if there was as way of calculating the back focus required to come into focus at near infinity?
Ideally I'd love to be able to do 5-10:1 macro work 
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Hello Colin,
Why not try extension tubes and/or bellows? If you want to experiment I could lend you some old Nikon F bellows (if I can find them

). They go from 30-40mm to 200+ mm I think. Just add a 50mm lens. You can even use reversing rings for more magn.
Best
JA