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Re: [ATM] Houghton Triplet Corrector

Optical designers will often use workable (for patent purposes)  but not 
optimum glass when applying for a patent to make it more difficult to 
duplicate for someone trying to copy the design.  In complex systems it 
could be a real chore to hit on the right glass for a single element.

Jan Bentz

Richard F.L.R. Snashall wrote:

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>Re: Figure 2 of the patent; the triplet corrector with the same glass 
>for all three elements
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>OK, I can understand why the author chose a high index glass (something 
>near N-SF6)...  the
>curvatures are shallower. But why such a low Abbe number --  doesn't 
>that just invite higher
>variation with wavelength?
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