Greetings Jon,
If I understand your post correctly, your friend wishes to mount a
reversed 50mm lens in front of the N*k*n's built-in lens. This is easily
done (in concept) with SLR's by simply connecting the two lenses
nose-to-nose with a Macro Coupler. These can be made or purchased pretty
cheaply. B&H sells them (pg. 67 current catalog) for about $8 and they come
in different size combinations depending on the filter ring size of the
lenses. Alternately for about the same price you can super-glue two step-up
rings nose to nose to achieve the same thing. It is possible to achieve
pretty dramatic magnifications (1:1 to 5:1) depending on the lenses you use.
To calculate the magnification factor, divide the focal length of the rear
lens by the focal length of the front lens eg. with a 100mm mounted on the
camera body and a reversed 50mm mounted on front: 100/50=2:1 magnification.
Getting good results is another matter since it is quite tricky to get a
flat field across the full frame. Depth of field is non-exsistant. Lots of
light and f32 is the order of the day at high mag. I have gotten some pretty
good results but usually plan on cropping the edges of prints.
This having been said, I don't know how you would reverse mount an SLR
film lens to the front of a digital camera lens due to the size disparity.
(I know, I just left a great opening for one of you wags) I have seen photos
on PhotoSig that were done this way with digital cameras (non-SLR) but I
believe they use a special reversed lens that is made for the smaller
digital lenses. Anyone who knows differently, please set me straight.
Charlie Geilfuss
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