Re: [ATM] ATM - Schiefspiegler!!! - (really a question about lens curves)

["Richard F.L.R. Snashall" <rflrs@rcn.com>]

Adam Perkins wrote:
>
>
> I don't how common a convex element of +/- 80" radius
> might be, but I'm hoping someone can point out a
> correlation between EFL and curvature of exposed
> elements in a "typical" achromat.  A simple lens would
> be ideal, but beggars can't be choosers in the surplus
> market.
>
Not surplus: JML Optical (www.jmloptical.com) has a lens,
stock number 77898, which is a meniscus, one of the radii
is a convex 2115.8 mm and its diameter is 63 mm.  The
material is SF8 or similar, I think.

Melles Griot had a doublet, LAO357, that had a similarly
shaped SF8 flint element, but I cannot find it on their
website.



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