Explore Scientific 100° Series 3" 30mm Waterproof Eyepiece (9EPWP10030-01) One 9.0 every 100° eyepiece is tested

every 100° eyepiece is tested by submerging them down to 1 meter of water for 30 minutes

Full Well: ~18

mount head

Backfocus: 19

Explore Scientific 100° Series 3" 30mm Waterproof Eyepiece (9EPWP10030-01) One 9.0 every 100° eyepiece is testedExplore Ultra Wide Eyepieces Comfort, Quality, Value. 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