Sky & Telescope Hot Products 2010 Winner! The Explore Scientific 9mm 100º Eyepiece has been getting lots of thumbs up from seasoned amateur astronomers and now you can have one of your very own for a great price! The eyepiece is waterproof and nitrogen-purged, and it comes with a replaceable soft, folding eyecup. Eye relief on the Explore Scientific 9mm 100º Eyepiece is 14.5mm, the barrel is 2" and accepts 2" filters.
Technical Data: -Barrel size:2" (50,8mm)
-Lenses/Groups: 9/6
-field of view: 100°
-eye relief: 14,5mm
-Weight: 890g