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Paul,
I have not seen a review comparing the 80ED (Orion,Saxon,SkyWatcher,Vixen, etc.) with one of the 80 Megrez telescopes. That brings up the question which Megrez are you talking about? There are 4:
Megrez 80 Fluorite APO 80/480 (TMB-lens)
Megrez 80 Fluorite APO 80/600 (TMB-lens)
Megrez 80 II ED Triplet APO also called 80 EDT
Megrez 80 II SD referred to as semi APO
I have seen optical test reports of the Fluorite Apo's (I am sure you can find some online) and of the ED80.
Both Fluorites are much better colour corrected that the ED80 and while the fluorites both had Strehl ratios of above 98, the ED80 had just below 90 as far as I remember (could have been just over 88, the diffraction limit).
The reviews on the Megrez 80 II SD suggest that the colour correction is worse than the one from the ED80. The Megrez 80 II EDT has about the same colour correction as the ED80 according to a dealer who sells both.
Geoff,
Which Megrez did you mean?
Stephan
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