Telescope Science
by John Torae

Telescope Calculations

When shopping for a telescope, there is are many parameters that may seem confusing to a new telescope buyer: Focal Length, Aperture, Power (more power is better – right?)

In these pages I will attempt to clarify some of the concepts important to the purchase of a telescope and what some of the terminology means. And why the telescope you might buy from a department store that advertises 300x, 500x, even 900x – Would best be used as a doorstop.

Woodland Hills Camera & Telescopes
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