Quote:
Originally Posted by Steffen
But they do! The Alter M615 is f/15 (so are the M715 and M815, in 7" and 8", respectively). My MK67 is f/12.
Cheers
Steffen.
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The Alter M815 (an 8 inch Maksutov) has a central obstruction of only 0.25
This telescope would , if diffraction limited, absolutely annihalate a 5 inch Apo refractor, when viewing planets. It seems to me to be a much better option for planetary enthusiasts than a smaller apo refractor.