Even if you are not an astronomer, the night sky is a great place to test a
binocular for resolution, color correction, edge sharpness and so on. Bright stars are a tough test for any optic and only a quality binocular will show a
star as a tiny, perfect pinpoint of light with no color halo. An average binocular will typically show a star as coma shaped or with spikes (flares) and only the finest
binoculars will be free of color fringing. Another great test for color fringing (chromatic aberration) is the edge of the moon. It is a rare
binocular, indeed, that will not show faint tinges of purple or green, here. How does your binocular stand-up? Take it out some night and
test it under the stars.