Tuesday, November 8, 2011
If a 8-inch reflector telescope has a focal length of 200 cm and the eye-piece has a focal length of 2.5 cm?
What an odd pair of telescopes! I've been active in astronomy for over 50 years and have never ever seen telescopes with focal lengths as long as these. 8-inch reflectors typically have focal lengths of about 1000 to 1200 mm and 4-inch refractors typically 900 to 1500 mm. Anyway, given these options, I'd choose the 8-inch reflector because of its larger aperture and shorter focal length. Even so, I'd probably need to use a stepladder to get to the eyepiece. Where did you get these crazy specifications?
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