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Re: [ATM] All Spherical Telescopes
Richard F.L.R. Snashall wrote:
>Hugues.Laroche@ses-astra.com wrote:
>
>
>>In the sub-aperture corrector branch of this zoology ;-) you may also
>>count the Icarus design:
>>
>>http://members.tripod.com/mipan/IcarusHome.htm
>>
>
>added the relay elements in the path, ending up with f/-12. It
>doesn't quite get to diffraction limited. I wonder if some other
>tweek would push it over. I like the fact that the lens pairs are
>mirrors of each other (except the spacing).
>
By increasing the base focal length and squeezing out some of the off-axis
performance:
Surf Radius Thickness Glass Diameter
OBJ Infinity Infinity 0
STO Infinity 8.339773 600
2 -5400 -2079 MIRROR 600
3 -2173.5 1449 MIRROR 149.6556
4 Infinity 179.4882 38.57416
5 Infinity 9 N-BK7 60
6 -77.85 10.9142 60
7 -69.63015 4.5 F2 60
8 -124.6395 415.9049 60
9 96.19802 3.5 F2 50
10 52.58412 9.88263 50
11 62.28 8.2 N-BK7 50
12 Infinity 453.292 50
IMA -246.4339 41.73529
The two N-BK7 lenses can be satisfied by OptoSigma
<http://www.optosigma.com/> lenses
011-2990 and 011-3770. The central visual Strehl is 0.806.
A later upgrade could be:
4 Infinity 127.483 38.57426
5 905.8383 4.5 N-KZFS4 60
6 137.5719 1.199993 60
7 153.6871 10 N-FK51 60
8 -166.53 462.9902 60
9 181.0594 10.5 N-FK51 55
10 -89.31551 15.0806 55
11 -68.87209 4 N-KZFS4 55
12 -166.7016 459.2385 55
IMA -244.2171 41.8301
The central visual Strehl here is 0.950. The edge visual
Strehl is still 0.920.
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