Re: [ATM] Baffles in a Complex Design

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

David Harbour wrote:
> No visualizing in 3-D is required; only 2-D.
>
> For lazy guys like me!!!
I was actually hoping for a more methodical approach.
Here's a picture of a simpler design:

    http://users.rcn.com/rflrs/schiefspf8-06x.jpg

The last cone would seem to be well prone to the
treatment shown in Rutten & van Venrooij, I think.
There still remains the question of the first four
cones.

BTW: This 200 mm f/8 design was set up to be put into
a nice box -- except the focus protrudes out a bit.
Seems to come out quite well, I think.  The "on-axis"
light exits parallel to the incoming "on-axis" light
and the focal surface is orthogonal; that is different
from what I've typically seen in Schiefspiegelers, which
have some sort of focal surface tilt -- perhaps this
does too, but I've ignored it in optimization.  The
focal surface is also quite flat -- more than 4.5 m RoC.
It's also slightly convex to the sky -- might actually
be a better match for some eyepieces.  In spite of that,
the green Strehl is better than 0.97 for the entire 1.5
degree field (> 42 mm diameter).  Sorry, for now, the
green Strehl will have to do, as the Visual Strehl takes
simply too long to compute. I've set up the prescriptions
for this are at:

    http://users.rcn.com/rflrs/schiefspf8-06x.atm   ATMOS input file
    http://users.rcn.com/rflrs/schiefspf8-06x.len   OSLO input file
    http://users.rcn.com/rflrs/schiefspf8-06x.txt   TEXT prescription
    http://users.rcn.com/rflrs/schiefspf8-06x.zmx   ZEMAX input file

Yes, I finally learned how to put tilts into ATMOS.  I cannot
say that I'm enamoured with Massimo's implicit exit ray
implementation, though -- maybe he's taken care of it all, though.




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