This dual purpose viewing/imaging Celestron Ultima Duo 10mm eyepiece uses a new eight element/five group fully-multicoated optical system to provide a wide 68° field of view for visual use. Integral 42mm T-threads under the removable roll-down rubber eyecup allow solar system imaging use with a SmartPhone, DSLR, or CCD camera.
The Ultima Duo 10mm is a good choice for medium to medium high magnification observing with long focal length refractors, reflectors, or catadioptric scopes – even under average seeing conditions. Its 10mm focal length is nearly ideal for an f/10 Schmidt-Cassegrain, providing a 1mm exit pupil that matches the resolution of the scope to that of your eye.
The full multicoatings of the 10mm Celestron Ultima Duo provide high contrast that makes it a good choice for resolving detail in planets and planetary nebulas, while its edge-to-edge sharpness makes it well-suited for lunar, planetary, and globular cluster observing with an SCT. (Some of the larger globulars, such as M13, will fill the 0.34 degree field with such a scope.) Smaller globular clusters appear vivid and nearly three-dimensional. It is also very good for medium power viewing with short focal length refractors and fast focal ratio Dobsonian reflectors.
Click on the "Telescope Eyepiece Formula" link in the "Formulas" tab above for a calculator that will show you the magnification and approximate actual field of view of this 10mm Celestron Ultima Duo eyepiece with your particular telescope.
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