Each type has spin-offs. Refractor telescopes gather light with the objective lens, where light enters the scope. The wider ...

Description: Specifications TV - 76TypeAPO (Doublet) Refractor (Elements/Groups: 2/1) Objective (mm) 76 Focal Length (mm) 480 Focal Ratio (f/#) 6.3 Drawtube/Focuser2-in ch, Focusmate dual-speed ...

Designers of refracting telescopes figured out, for one, that by using two different kinds of glass together in the objective lens, they could cause the red and blue ends of the spectrum to ...

9.53 inch Clark Refractor The main telescope is the original 9.53 inch refractor built in 1885. The objective lens was made by Alvin Clark and Sons of Cambridge, Massachusetts, and has a focal length ...

Should you buy a telescope with a refracting lens or a reflecting mirror? It depends on what you want to look at, and your ...

The standard telescope of Newton's time, the refracting telescope, was not ideal. Its glass lenses focused the different colors inherent in light at different distances. This resulted, at the ...

is a type of optical telescope that uses refracting optics such as lenses to form an image. Catadioptric: A catadioptric telescope is an optical telescope that uses both reflective and refractive ...

This 82mm/3.2-inch refractor is one of a kind in that ... an image of the moon by holding your smartphone's camera lens up to a telescope's eyepiece, you'll know it's a tricky maneuver.

After all, as a refractor telescope it uses a lens to form an image so it’s necessary to stand behind the optical tube to look through an eyepiece. There are fewer telescopes easier to set-up ...