"alphaQuad" <alp### [at] earthlink net> wrote in message
news:web.4887835c2dc5bc4e7da27f240@news.povray.org...
> Focusing:
>
> there seems to be at least 2, maybe 3 vars to focusing. all for position
> and
> radius of concave lense.
>
> focusing seemed impossible trial and error. difficult to tell if your
> going the
> right way, like throwing random numbers at it.
>
>
> focusing needs a calculation I have yet to devise.
what about thickness of the lens? that was to be my next test until i got
side tracked
Jim
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