Archive for April, 2010

How well can I see Venus or Mars with a Celestron AstroMaster 114 EQ telescope? And which eyepiece is best?

Tuesday, April 27th, 2010 at 6:37 am  
Comments (1)

I've got 10mm lens and 20mm...
Which one is the best to view smaller planets like Mars and Venus? And how well can I see them?
Thank you

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A telescope with 20cm primary mirror has f# of 5. What focal length of the eyepiece to get 100x magnification?

Sunday, April 25th, 2010 at 1:27 am  
Comments (3)

A telescope with a 20 cm primary mirror has an f# of 5. What would be the focal length of the eyepiece required to give a magnification of 100? I know there's an equation, but I don't know what it is. Thanks in advance.

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