This dual purpose viewing/imaging Celestron Ultima Duo 13mm 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 13mm is usable with any scope type, under virtually any seeing conditions – from fair to superb. (Rain, snow, or fog might limit its usefulness, however.)
With short focal length refractors the 13mm Ultima Duo is a low power eyepiece. With the 430mm focal length Astro-Tech AT72ED, for example, it gives you 33x and a 2.06° field that is more than four times as wide as the full Moon. This is well suited for observing open clusters such as the Pleiades and large nebulas such as the Lagoon. Both will fit nicely into its field when used with the Astro-Tech AT72ED, with a framework of black sky around the objects to set them off.
This Celestron 13mm Duo is also quite good for medium high magnification observing with long focal length refractors, reflectors, or catadioptric scopes. Its 13mm focal length works well with an f/10 Schmidt-Cassegrain, with excellent optical performance that makes it a much better choice as a second eyepiece than merely doubling the power of most scopes’ standard 25-26mm eyepiece with a Barlow.
The full multicoatings of the 13mm 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 nearly fill its 0.44 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 13mm Celestron Ultima Duo eyepiece with your particular telescope.
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