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Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
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The focal lengths of an objective lens and eyepiece are 192 cm and 8 cm respectively in a small telescope. Calculate its magnifying power and the separation between the two lenses.
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Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
Is there any equation to calculate the optimal focal length in a Newtonian telescope? - Quora
