Terminology - What do the numbers mean? All binoculars will have two numbers to designate them, such as 10x50. This means a binocular with 10 times magnification and 50mm objective lenses (the big ones!)....
How to calculate magnification (power) of a telescope or spotting scope? Identify the focal length of the scope. This is often marked on the body of the scope or it should be given in the user manual. For...
Introduction This electronic digital eyepiece has a standard fitting interface with eyepiece adapter (i.e., Diameter=1.25" or 31.75mm, fitting height=17mm) that can be fitted to a spotting scope or telescope...