[header] How to select astronomy binoculars [title] Consider aperture and magnification : [step] The two most important qualities of binocular selection. Aperture refers to the diameter of the lenses. The larger the aperture, the more light the binoculars gather and the better you will be able to see faint objects. 
Magnification refers to how large the image appears and is limited by the aperture size. Be wary of binoculars that are advertised by magnification only.