One of the things I like about
astronomy binoculars in cold weather is that there is little focusing, needed. Even with a center-focus astronomy binocular, such as the
Celestron 20x80 Skymaster, you will basically focus once and forget about it. This means you can wear the warmest mittens and leave them on, rather than constantly removing them as you do every time you change eyepieces on a telescope. With a handheld astronomy binocular, such as the
Celestron Ultima DX 8x56 or
Ultima DX9x63, make certain that you use the strap. With mittens on, too big a chance that astronomy binocular will slip out of your hands.