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It is even better that that Steve, ALL surfaces are spherical ( easy and accurate manufacture) and the corrector elements (lenses) in the secondary are traversed twice so negating any CA. It is a very cunning design worthy of Broderick. The images tell the story. My mount was not good enough to get images without 'JUMPS'.
The main mirror is tapered and also mounted by being held centrally and there is no mirror 'flop' as it is held and adjusted by six bolts for collimation and focus is done by a helicoid focuser outside the tube assembly.
Bert
Last edited by avandonk; 12-10-2006 at 06:27 PM.
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