Newtonian Reflector

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Newtonian Reflector

a type of reflecting telescope in which the rays reflected by the primary parabolic mirror are intercepted by a plane mirror and reflected to the side of the telescope tube, where the light-receiving equipment is located. Used only in small telescopes, it was designed by I. Newton around 1670.

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Using a 12 1/2-inch f/4 Newtonian reflector and the T-threaded interface ring, the author experienced strong vignetting in this image of NGC 4565 that could not be corrected with flat-field calibration.

The QHY16200A CCD Camera: This camera offers a generous 16-megapixel field at an attractive price

Newtonian reflectors from the 1960s and 1970s can be excellent if the mirror coatings are still in good shape.

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An altazimuth variation that's popular on Newtonian reflectors of all sizes (from $200 starter scopes to 36-inch monsters) is the Dobsonian mount.

Buying the best telescope: We all want the best buy for our budget. Here's what you need to know to acquire a telescope that can last a lifetime

The popular f/10 Schmidt-Cassegrain requires focal lengths of 10 to 5 mm, while the increasingly common "fast" f/5 Newtonian reflector needs 5 to 2.

Eyepieces for planetary observing: Jupiter and Saturn are easy to observe now--but what eyepiece type will give the best views?

This photographically fast Newtonian reflector is built around a 150-mm parabolic primary mirror manufactured from B270 glass that reaches thermal equilibrium quickly.

Budget astrograph

This turned out to be a 10" Newtonian reflector on a Sellers mounting, a very substantial instrument in those days.

Peter D. Wroath, 1926-2008

5-inch (114-mm) Newtonian reflector uses a corrector lens in its focuser, thereby permitting a long focal length of 1,000 mm (f/9) to be packaged into a tube only 18 inches long.

Telescope buyer's guide: our guide to 115 refractors, reflectors, and catadioptrics lets you make an intelligent, scope-by-scope comparison

With a refractor or a Newtonian reflector, the focal length is approximately the same as the tube length.

Be scope savvy: looking for that first telescope, or thinking of moving up to a better one? Here's what you need to know as you ponder the vast selection available to you

His 20-hour cumulative exposure using a home-built 16-inch Newtonian reflector and CCD camera identifies objects down to magnitude 24.

Pushing the limit: an intrepid astro-imager goes where no amateur has gone before

5-inch (114-mm) Newtonian reflector with a focal length of 910 mm (f/8) that comes with a German equatorial mount and a gold-anodized aluminum tripod.

Telescope buyer's guide: our guide to 82 refractors, reflectors, and catadioptrics lets you make an intelligent, scope-by-scope comparison

4 Newtonian reflector features a plate glass parabolic primary mirror in an eye-catching tube.

Tabletop telescope

Extraordinary detail is visible on Jupiter's cloudtops in this tricolor CCD image obtained September 4, 1999, with a 10-inch f/8 Newtonian reflector from Di Sciullo's home in Coconut Creek, Florida.

Our solar system: some of the most breathtaking images of our universe are of things visible with only a small telescope or even with the naked eye. The following is a sample of the wonders that one can behold within our own solar system