> 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 just read Shaw's book, and the reversed lens should remain open, the prime
lens controls exposure and DOF
Foxy
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