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

What is the benefit of a 2″ eyepiece compared to a 1¼” eyepiece? Tom NagyNorth Ridgeville, Ohio A 2″ eyepiece delivers a ...

A total lunar eclipse is set to wow North American astrophotographers on March 13 and 14, here's how to photograph this ...

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

The focal length of the telephoto lens is equivalent to 737mm, which isn't as powerful as traditional telescopes selling for the same price. Still, the built-in photography functions make up some ...

I spent two months testing the Dwarf 3 smart telescope, and it changed my perspective of astrophotography.

NASA’s two-for-one launch of its newest space telescope, SPHEREx — designed to seek out the key ingredients for life in the Milky Way — alongside a sun-focused mission called PUNCH is facing ...

Astronomical telescopes, such as the Newtonian telescope ... determining that the focal length of a spherical mirror is about one-half the radius of curvature. Figure 5. Image formed by a concave ...

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 ...

\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.