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Which 8" Mirror Is Better? F4 Or F5.6?

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Posted by Jerry Lord on June 1, 2004 22:11:14 UTC

I am building a Dob with an 8" mirror and 2" focuser. I have a choice of an F4, or an F5.6 mirror. which one would be better and why? I know more light will come thru with the F4 but would there be much of a difference?

Should I go with the one that gives me a larger FOV? Or should I go for better magnification?

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