Quote:
Originally Posted by JohnH
Have you actually used one of these 127s?
A sort of semi APO ? It is a air spaced triplet APO design I guess your comment is based on the use of ED glass? I am not an optician so I cannot critique the design or material choices however what I do know is mine out perfomed my vixen VC200L (8") in both resolution and contrast, colour correction is on a par (when carefully focussed) and the only area where the VC200L won is field flattness. Visually the stars a shaper and perfomanace on planets is superior with the 127 and there is no noticeable difference in light gathering (under suburban skies).
The VC (and most SCTs) need a focal reducer to be useable for AP and the APO does not.
My focuser is not stiff and the build quality seems to me to be on a par with the Vixen kit.
In short for the money I cannot fault the 127 APO - sure it is not the ultimate 5" APO - but then I did do not have $5000+ to spend on a scope.
5" APO vs 8' Meade SCT was the question - 5" APO is my answer.
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I bought it last week for testing. You need to compare it to other quality APO refractors, then you'll know the difference. Don't get me wrong, it's good value for money; but the colour correction isn't on par with any quality APO's on the market (triplets or doublets). Try testing it in and out of focus with bright stars. I think the focuser needs some improvement, but that's just my opinion based on my standards.