Quote:
Originally Posted by alfredbird
I am a little bit confused now.
Wiki says NGC 5139 is about 36.3 arc sec, why it occupys more than 50% of my EP which should have FOV of 42 arc min.
EP 13mm, 65 FOV on a 1200mm F/4.7 10 inch dob, which gives FOV of 0.7 degree.
anyone can help me this those calculation? many thanks.
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Hi Alfred,
36'.3 is in fact 36.3 arcminutes. Jupiter is from 30 to 50 arcseconds in diameter, written 30" to 50".
Regards, Rob