a_canuck Posted October 22, 2011 Share Posted October 22, 2011 just to make sure I have this down right:1200mm focal length, 200mm aperature, = f/6with an eyepiece of 25mm that would mean:25mm /6 =4.1 or 4mm exit pupil Link to comment Share on other sites More sharing options...
Stephen Posted October 22, 2011 Share Posted October 22, 2011 Yup Link to comment Share on other sites More sharing options...
damnut Posted October 24, 2011 Share Posted October 24, 2011 Hi A_canuck,Also see link below, just fill in the blanks !!N.A.A. Telescope Math CalculatorCheers Link to comment Share on other sites More sharing options...
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