T3D Re: T3D Re: T3D Re: Now yer in trouble

[bercov@xxxxxxxxxxx (John Bercovitz)]

> What was the reason that the Kodak/Realist viewers had 
> longer-than-ortho lenses?

Shorter lenses with enough coverage are not cemented doublets
and so cost more for the extra elements and mounting.

> So which common viewer has the largest diameter lens and sufficient
> focus range to have a shorter lens work (or be modifiable)?

Star D?  The shorter lens needs less focus adjustment but you need
to mount it closer to the transparency although this might be a 
spec too.

> A project like a custom lens, it seems to me, would
> need quite a few participants.

I agree.  Not sure if anyone has done the multiplication yet
but 250 pair * 2 per pair * $100 per lens = $50,000.

John B


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