100° Series 3" 30mm Waterproof Eyepiece Brand_Optolong The wavelengths of 550nm (green)

The wavelengths of 550nm (green) and 630nm (red)

the 40mm is also the only 2

eyepiece in this series

The wide part of the taper prevents the diagonal from accidentally falling out of the focuser if the set screw loosens up

100° Series 3" 30mm Waterproof Eyepiece Brand_Optolong The wavelengths of 550nm (green)The Explore Scientific 100 Series eyepieces are hyper wide class oculars that can transform your visual astronomy experience. You may be startled at the amazingly wide expanse of inky black sky you behold the first time you bring your eye to a 100 Series eyepiece, and after awhile, you may even forget that you have an eyepiece between you and the universe! With an apparent field of view that is close to the maximum for hyper wide eyepiece design,