Quote:
Originally Posted by LewisM
I use a Vxien 8" R200SS astrograph for visual and astrophotographic purposes interchangeably, but maybe that has something to do with the extreme accuracy of their optics?
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I have a suspicion Vixen source optics from a multitude of makers and perhaps only re-figure at best. There's nothing wrong with a fast Newtonian, other than coma which can be corrected. Or the larger obstruction than reduces contrast and limits them as regard planets and double stars.
But I like planets and double stars, so my 6" F8 Newt has only a 1 inch secondary. That 6" scope certainly splits double stars way better than a 4" Vixen fluorite. But because there is still an obstruction the images are "softer" than in the fluorite.
It is a fact that exceptionally fine optics can make up for
some of the loss of contrast by obstruction.