Re: [ATM] 290 mm f/7.5 Refractor Design

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

Richard wrote:

>What does your merit function look like?. Are you doing a fairly
>lengthy global optimisation?. I do agree though, it needs some
>fairly hefty hints on optimisation, and the parameters for
>limiting element positions are archaic (and arcane).
>
Actually, for these Petzval-like designs, I'm using a (to me)
weird merit function.  I'm not using the default merit function
at all, but some more primitive operations.

However, I generally do not like to use position limiting
operators.  I have some thickness goals, expressed as a fraction
of the semi-diameter, but not limits.

I've not found the global optimizer much help yet.  However, when
I actually found this solution, I started by forcing two surfaces
flat;  I suspect that means I may have some excess degrees of
freedom -- even after adding the extra requirements for zonal
correction and flat field.
_______________________________________________
ATM mailing list http://www.atmlist.net/