[ATM] Wynne Newtonians
towne56 at frontiernet.net
Sun Apr 18 01:40:32 JST 2010
Not really. I did notice that and looked around for a better fit, but
didn't find one. It may simply be that the optimization by chance found
a local minimum in the 4.0 case that is poorer than the 3.5 case. That
seems to happen. It may be that more effort would yield a better
design. If there is an optical reason for it, I don't have a clue.
Richard F.L.R. Snashall wrote:
> Nathan Towne wrote:
>> The all-bk7 versions are at these links:
> Looking at these, the Strehl for the f/3.5 version is better (at the
> field edge) than the
> f/4.0 version. Have you surmised a reason for this?
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