Adjustable eyecups, which are common on most modern binoculars, serve the dual purpose of excluding extraneous sidelight and positioning the eye pupils the correct distance from the eyepieces so as to ...

This is where binoculars have an advantage over even the best telescopes available. Most telescopes use a single eyepiece. Binocular literally means "two eyes". You get twice the opportunity to ...

The distance between your eyes and the binocular eyepiece lenses. If you wear glasses, look for a larger eye relief number to allow for more space between your glasses and the binoculars.

I found it useful to have a tripod that has an elevator column so that you can smoothly adjust the eyepiece position for those who are not the same height. You can purchase the binoculars with a ...

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 ...