and what should be the minimum focal length of objective lens and focal lens. I've a celestron which have 300mm focal length of objective lens and 6/4/12/20 mm of eye piece but it's hard for me too the jupiter so I asked here "what should be the minimum magnification of a telescope?"
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Could you edit your question to specify what you want see on Jupiter. – Dr Chuck Apr 22 '18 at 20:54
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It's possible you're having trouble using it or configuring it properly. Suggest you post more info (use "edit" on your question ) and perhaps a photo of what you do see if possible. – StephenG - Help Ukraine Apr 23 '18 at 07:55