P3D Re: 7-perf Red Buttons

[Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Thu, 01 Jan 1998 
>From: Eric Goldstein writes:
>..................
>Archomatic doublets are only sharp and flat for about 65% of the center
>field; the edges go soft and distort (pincushin?). You can see some of
>this with 5 perf slides, but it obviously becomes much more pronounced
>with 7-8 perf. They are not close to equaling the performance of the
>camera optics...

*****  So what is needed is a FLAT achromatic lens large enough that an
entire 8 perf slide fits easily within that 65% of the central area. What
size would that be? Does that mean we need to use a medium format viewer for
35 mm?

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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