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15
PART V: Operating Your Telescope
Slowly turn the focus knobs under the focuser, one way or the other, until the image in the
short focal ratio telescopes, particularly when they haven’t yet reached outside tempera
ture. Refocusing is almost always necessary when you change an eyepiece.
5.2 Focusing the Telescope
Fig.5.2.a
5.3 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
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.
moon then look at the shadows in the craters!
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