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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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  • $\begingroup$ Could you edit your question to specify what you want see on Jupiter. $\endgroup$ – Dr Chuck Apr 22 '18 at 20:54
  • $\begingroup$ 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. $\endgroup$ – StephenG Apr 23 '18 at 7:55
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The 10 mm ocular should work fine. It will give you 60x of magnification.

More on this here

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