Compound, or catadioptric, telescopes combine lenses and mirrors for a compact option, suitable for both planetary and ...

The refractor comes with a 25 mm eyepiece, 1.25-inch star diagonal, heavy-duty stainless steel tripod, accessory tray, spirit level, Starry Night Special Edition software and a 6x30 finderscope.

The refractor offers plenty of room to add an electronic field rotator, which is a necessity if you wish to make the RedCat 91 the centerpiece of a robotic system.

Refractor to reflector, Schmidt-Cassegrain to Maksutov-Cassegrain - this is everything you need to know about the different types of telescopes. When you purchase through links on our site, we may ...

A basic 4-inch/100 mm refractor, it's got no 'go-to' features so you're going to have to be confident enough to find your own targets in the night sky. Celestron Inspire 100AZ (Blue) at Amazon for ...

A refractor or refracting telescope uses an objective lens to collect light and form an image, astronomical telescopes combining it with an eyepiece at the back of the standard tubular design for ...

Galileo's refractor and Newton's reflector remain the two standard kinds of optical telescopes today. Learn more about these two types of telescopes.

Thinking about shooting the stars? Here’s how a camera lens stacks up against a refractor for deep sky photos.

Lowell Observatory and the venerable Clark refractor again played central roles. Two NASA-funded programs were initiated at that time, both centered on the observatory and partner institutions.