A 2″ eyepiece delivers a wider true field of view (the actual amount of sky visible) than a 1¼” eyepiece of the same focal length. Two factors determine the true field: the telescope’s ...

The dream of a flat, lightweight telescope lens, where microscopic etchings precisely refract different wavelengths of light, ...

Here's how an innovative flat lens could solve these problems for satellites and space-based telescopes. Understanding ...

Because his telescope offered a much greater field of view, astronomers had plenty of room to improve magnification. One way to do that, they knew, was to make the focal length of the eyepiece ...

the lens' focal length. The only caveat with this setup is that it introduces more glass, so it could reduce the image clarity. The next option is to use a telescope. We've thoroughly tested ...

We put Starfield Optics' flagship Géar telescope — the Starfield Géar 115 Triplet APO — to the test. It did not disappoint.

and that this could be overcome by making lenses with longer focal length, resulting in monsters like Hevelius's 45-metre-long telescope in Danzig. Two key inventions enabled astronomers 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 ...

116, No. 817 (March 2004), pp. 266-000277 (12 pages) ABSTRACT We discuss the system requirements for obtaining millimagnitude photometric precision over a wide field using small‐aperture, short focal ...