Part two in my series on buying a telescope
In part one, I discussed why aperture is important in choosing a good telescope and also about telescope power. As I continue my series, I will discuss the refracting telescope. Be sure to check back for part 3 on reflecting telescopes!
The refracting telescope
Refracting telescope are the most common form of the telescope – a long tube where light passes directly from the front objective lens directly to the eyepiece at the opposite end of the tube.
Advantages
ﾷ Easy to use due to the simplicity of design.
ﾷ Good for distant terrestrial viewing
ﾷ Excellent for lunar, planetary and binary stargazing especially with larger apertures
ﾷ Sealed tube protects optics and reduces image degrading air currents
ﾷ Rugged, need little or no maintenance
Disadvantages
ﾷ Generally have small apertures, typically 3 to 5 inches
ﾷ Less suited for viewing small and faint deep sky objects such as distant galaxies and nebulae
ﾷ Heavier, longer and bulkier than equivalent aperture reflectors and catadioptrics
ﾷ Limited practical usefulness
ﾷ Good-quality refractors cost more per inch of aperture than any other kind of telescope.
