This Meade 20mm waterproof 2" Ultra Wide is an exceptional medium focal length eyepiece with a very wide 82° field of view. It is O-ring sealed and nitrogen-purged to be 100% waterproof.
This 2” Meade eyepiece uses seven optical elements for sharp, well-corrected performance across a very wide 82° field of view. With an eye relief of 17mm, it is quite usable with eyeglasses, and its twist-up eyecup lets you match the eye relief to your eyesight and/or eyeglass use.
The 82° field of the Meade 20mm Ultra Wide is so wide that you can’t see the field stop without moving your head from side to side, so the eyepiece seems to disappear in use. It gives you the feeling of looking through a picture window into space, rather than through a constricted tube, as with a conventional narrow field eyepiece. This unrestricted view is very impressive with fast focal ratio/short focal length scopes such as fast apo refractors or Dobsonian reflectors. For example, a 10” f/4.5 Dobsonian reflector will have a full 1.4° field at 57x with this eyepiece, and a bright 4.4mm exit pupil. A 5.1” f/6 refractor will have a very big 2.1° field at 39x, with a 3.3mm exit pupil. Even with a long focal length 8" f/10 SCT, it provides a hefty 0.82° field at 100x with a 2mm exit pupil.
The eyepiece calculator that you'll find in the "Formulas" tab above will show you just how much magnification and field of view this eyepiece will provide with your particular telescope.
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