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• k across or over objects that are producing heat waves. This includes asphalt parking lots on hot summer days or building
rooftops.
•
ographing under these conditions, the processed film may come out a little grainier than
• may want to remove them when observing with an eyepiece attached to the
telescope. When using a camera, however, you should always wear corrective lenses to ensure the sharpest possible focus. If you have
astigmatism, corrective lenses must be worn at all times.
When working with any optical instrument, there are a few things to remember to ensure you get the best possible image.
• Never look through window glass. Glass found in household windows is optically imperfect, and as a result, may vary in thickness from
one part of a window to the next. This inconsistency can and will affect the ability to focus your telescope. In most cases you will not
be able to achieve a truly sharp image, while in some cases, you may actually see a double image.
Never loo
Hazy skies, fog, and mist can also make it difficult to focus when viewing terrestrially. The amount of detail seen under these
conditions is greatly reduced. Also, when phot
normal with lower contrast and underexposed.
If you wear corrective lenses (specifically glasses), you
29
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