Newtonian Reflector Telescopes
Newtonian telescopes (also known as catoptrics)
usually use a concave parabolic primary mirror (longer focal ratios may use
spherical primaries) to collect and focus incoming light onto a flat secondary
(diagonal) mirror. This secondary mirror reflects the image out of an opening at
the side of the main tube and into the eyepiece.
reflector telescopes offer a number of excellent features
- Freedom from most optical aberrations and delivery
of very bright images.
- Reasonably compact and portable to focal lengths
- Excellent performance observing faint deep-sky
objects such as nebulae, remote galaxies and star clusters.
- Lowest cost per square inch of aperture due to use
of mirrors rather than lenses.
- Generally fast focal ratios: f/4 to f/9.
The 76mm (3") aperture of the Firstscope 76 models
offer much of the performance of the Newtonian reflector design in a compact,
highly portable instrument.
The 114mm (4.5") Newtonian equatorial telescope is
the most popular size telescope for the more serious beginning or intermediate
level astronomy enthusiast, and for good reason. The large light gathering power
of this 4-½" telescope makes it ideal for deep-sky observation 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 the very
first time looking through a telescope's eyepiece, through years of observing
interesting subjects near and far in the night sky.
Celestron offers five different 114mm Newtonian
equatorial telescopes, making it a sure bet that one of them will have just the
combination of features and performance you're looking for.