Putting the telephoto lens (200mm, etc) onto the
camera and reversing a 50mm lens onto it as a
supplementary lens is a great way to get extremely
high magnification (4X in this case).
The trick is to use the diaphragm of the reversed
lens (the one in front with its rear elements unprotected)
to control both exposure and depth of field.
The telephoto (prime lens) on the camera should remain
wide open. Closing it down will reduce the image circle
(read vignetting) on the film.
Source: Alfred A. Blacker, Field Photography page 300
Additional Source: John Shaw, Nature Photographers Complete
Guide to Professional Field Techniques
pages 118 to 121
Hey, I see John Shaw has a little protector gizmo on his Stacked lenses
(photo page 121) too!
I think a 7mm extension tube would work perfectly, unless one
wanted to mount a ring flash on the end of the reversed lens
which is what my drilled out plastic lens back protector with
the epoxy attached filter step up ring does.
Hank Hogan
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