SKY-WATCHER AZ-GTix - Choosing the Appropriate Eyepiece

PART II: OPERATING YOUR TELESCOPE
2.3 Choosing the appropriate eyepiece
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length by the focal length of the eyepieces you are going to use. For example, a 10mm
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When you are looking at astronomical objects, you are looking through a column of air
that reaches to the edge of space and that column seldom stays still. Similarly, when
viewing over land you are often looking through heat waves radiating from the ground,
you end up magnifying is all the turbulence between the telescope and the subject. A
aperture under good conditions.
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moon then look at the shadows in the craters!
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