This new Meade 5.5mm waterproof Ultra Wide Angle eyepiece is an outstanding short focal length eyepiece for high magnification observing with all telescope types. It is O-ring sealed and nitrogen-purged to be 100% waterproof.
This 1.25" eyepiece uses seven optical elements for sharp, well-corrected performance across a very wide 82° field of view. At 13mm, its usable eye relief is quite long for such a short focal length eyepiece, and its twist-up eyecup lets you match the eye relief to your eyesight and/or eyeglass use.
The 82° field of the Meade 5.5mm 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 wide window into space, rather than down a constricted tube, as with a conventional narrow field eyepiece.
The Meade 5.5mm Ultra Wide eyepiece has a 0.55mm exit pupil with an f/10 Schmidt-Cassegrain telescope. This is very close to the 0.5mm exit pupil that most observers consider to be the smallest usable for high magnification observing before the image becomes too dim to be useful (in this case 364x with an 8” f/10 scope, or about 45x per inch of aperture).
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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