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| Submitted by Paul Valleli on 01/16/2007 15:38:53 |
HET Secondary Corrector System & Alt-Az Mount A spherical primary can be corrected for Spherical Aberration,Coma, and Astigmatism with a Mangin -Relay lens Combo (ATMoB member Don Dilworth design) or with a modified Abbe Reflector-Corrector - requires spacing, tilt, and decenter adjustments. Another way is with a strongly Hyperbolic secondary -very tiny FOV |
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