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Good question Kenneth. My AT66ED is about f/6, so I don't think that qualifies as fast. It's not slow, but not really fast either.

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Interesting, Michael. The AT66ED is exactly the scope I had in mind when I asked the question. I'm seriously considering getting one for a grab and go travel scope, and looking at options for a diagonal.

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Kenneth



Zhumell 10" Dobsonian (f/4.9)
2" 32mm WA eyepiece
9mm, 12.5mm, and 20mm Plossls
6mm TMB/BO Planetary
2" 2x ED Barlow
Nikon 10x50 binocular (6.5 deg FOV)

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