The intrinsic value of a fine binocular lies in its ability to produce bright, sharp, aberration-free images. But you can only get the most out of your optic if you know how to adjust a binocular.

The big day’s here: Your first telescope has arrived. You’ve done your research and decided on an 8-inch Dobsonian-mounted reflector, or perhaps a 4-inch refractor, or another model that had a great ...