What do binocular numbers mean? may seem like a simple question. But the truth is that it can be as simple or as complicated as you want. If you’re just talking about the numbers in “10×42” or “8×32,” ...

The magnification (or power) you will see through a given optical system depends on the telescope and the eyepiece. The simple formula is: Magnification = Focal length of telescope ÷ focal length of ...

“Maximum usable” magnification is a rough number someone about 30 years ago invented to give observers an idea of the upper magnification limit they could expect from their telescope.

The 10x Ultra Macro optic is said to have a working distance of 40.35mm in the 1-5x magnification range, and 22.5mm if you ...