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2" Focuser On A 6" Telescope?

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Posted by Jeff on May 23, 2002 08:45:54 UTC

Hello,
I am totally new to ATM,but I am thinking about building a 6" f/5 dob with commercial optics(looking at Discovery for the mirrors).It will be my quick/portable scope.I already have a larger scope and some eyepieces including one 2" Panoptic(27mm).The field of view with my Panoptic looks nice on paper with this telescope configuration BUT.......
I am wondering if a 2" focuser is overkill on this small of a telescope.I mean would 2" eyepieces have alot of vignetting?How could the light from a smaller than 2" secondary fill a 2" eyepiece?
I am leaning towards a 2" crayford or helical...largely because I have not found any 1.25" focusers that are as low profile as the 2" focusers I have been looking at.(I'm looking at the MoonLite crayford focusers or the helicals by Gary Wolanski and would appreciate any comments from anyone who has used these products).
thanks,
Jeff

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