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Richard,
I simply wanted to show what kind of spot sizes one could expect without tilting the eyepiece. So, yes, I let the optimization algorithm proceed without allowing for a focal plane tilt. One could add another coordinate break and let the program determine the optimum tilt. But unless one built as an accessory a holder to hold the eyepiece at the specified tilt, then one would not realize the calculated image quality, no?
Roger
----- Original Message -----From: Richard F.L.R. SnashallSent: Sunday, June 28, 2009 3:23 PMSubject: Re: [spiderless] Some New Folded Long-Focus Chiefs with Melles-Griot LensesRoger Ceragioli wrote:
>
> The first design gives 40" between the mirrors, which is a convenient length. The primary mirror does not HAVE to be aspherized, but doing so will sharpen the image. The design assumes a paraboloidal primary. The f/ratio is 11.4.
By not specifying the focal surface tilt of 1.2 degrees,
are you attempting to optimize it in a particular way?
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