Quote:
Originally Posted by miki63au
The 6" achro used to be legendary because of higher contrast than mirror based systems (for equal price). How is nowadays the quality of this doublets?
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Miklos, If you put a 6" off-axis aperture stop on a 12" Newt you'll see superior images to a 6" F8 Chinese refractor. I have two 6" F8 Achromats and consider that the star images are looking soft and distinctly yellowish with a 12mm eyepiece, due to Chromatic Aberration.
A stopped-down Newt has no such limitations. Its great to be able to remove an aperture stop on a larger Newt, when you want to see some detail in deep sky objects.