Originally Posted by
Dan Fromm
Kanga, there's a rule of thumb to the effect that half of a convertible lens covers roughly the same circle as the complete lens. Check carefully before sacrificing a 16x20 Cibachrome sheet. Arne Croell believes that the RF- series of six elements in four groups double Gauss type process lenses cover 45 degrees. If he's right, and he usually is, don't even bother.
I'm sorry, but there just aren't that many lenses that cover 16x20. If the trick you want to try worked well, it would be well-known.
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