Quote:
Originally Posted by Satchmo
While theres nothing to be done about focusser position other than some classy after-market ball bearing rotating mount rings for ergonomics , there are certainly no diffraction spikes other than any mirror clips in a Mak-Newt and the central obstruction is relatively modest on an F5.3 .
With good native off axis spot performance they should be optically superior to any 8" apo provided you are not going for a really large diameter focal plane - not that there are many 8" APOs in the world as the cost of the glass is prohibitive for even the keenest retractor buffs !
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No diffraction spikes on the MN190 but I do like the simplicity of the straight through focusing position on a refractor or SCT/CDK ect. Makes balancing in all three axis a lot easier
