Newtonian reflector telescopes use a concave parabolic primary
mirror to collect and focus incoming light. A small, flat diagonal
mirror reflects the converging beam of light into the eyepiece on
the side of the tube near the top.
Newtonian telescopes offer a number of excellent advantages including:
- Bright images and complete freedom from color aberrations.
- Excellent for observing faint deep-sky objects such as nebulae,
star clusters and remote galaxies.
- Lowest cost per inch of aperture due to use of mirrors rather
than costly lenses.
- Fast photographic speeds: f/4 to f/9.
The 6" Newtonian telescope is the most popular size telescope for
the serious beginning or intermediate-level astronomy enthusiast,
and for good reason. The large light gathering power of the 6" telescope
makes it ideal for dark-sky observations of galaxies, star clusters
and nebulae, as well as lunar and planetary observing. This makes
for a very useful and versatile instrument that can take an observer
from his first views through years of advanced observing. |
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