Want to learn about telescopes, binoculars, microscopes, spotting
scopes, or accessories, like a filter, an eyepiece or other optical
products? Scope City offers this free optics crash course for beginners
to help them make the right choice and best buy. There is also information
for the intermediate and advanced observers. 
Telescopes come in three varieties: ,
, and .
Each kind of telescope collects and focuses light so that it can be
magnified or recorded, but each does so differently. All perform well
when properly designed and manufactured, but each has its own special
Astronomy is a fascinating lifetime hobby enjoyed by young and old.
Today, computerized telescopes and their accessories make it easy
and exciting for beginners to find celestial objects and to track
them as the Earth rotates. 
A set of photo-visual color filters is an important observing aid
that every planetary astronomer should have. Color filters help overcome
image deterioration caused by atmospheric scattering of light, permits
separation of light from different levels in a planetary atmosphere,
increases hue contrast between areas of differing color, and reduces
irradiation within the observer's eye.