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Celestron 21mm Ultima Duo Eyepiece (Discontinued)


$119.00


SKU: 93445
Manufacturer: Celestron
Eyepiece Focal Length: 21 mm
Apparent Field: 68 degrees
Eye Relief: 20 mm
Barrel Diameter: 1.25 inches

This product is no longer available
The 21mm Ultima Duo is a good low to medium power eyepiece that also offers a 1.6x gain over prime focus when used for eyepiece projection photography. 

Enjoy impressive views with a wide 68-degree apparent field of view. Celestron’s fully multi-coated optics increase light transmission and contrast, while blackened lens edges prevent internal reflections. The result is bright, pinpoint stars on a black field. A generous 20mm of eye relief and fold-down rubber eyeguard make Ultima Duo comfortable to use without removing eyeglasses.

DSLR Imaging Applications

What really sets the Ultima Duo apart is the integrated T-Adapter for imaging applications. Unlike competitors’ eyepieces, you won’t need to spend money on expensive adapters for your camera. The industry-standard 42 mm T-threads are integrated for a direct, secure connection to your DSLR or astronomical CCD camera. Just remove the rubber eyeguard to expose Ultima Duo’s integral T-threads. Then attach your DSLR camera (with compatible T-ring) and you’re ready to capture crystal clear images! Ultima Duo is ideal for imaging bright solar system objects like the rings of Saturn, craters on the Moon, and Jupiter’s Great Red Spot.

Imaging with Smart Phones

Imaging the Moon and planets is even easier with Celestron's Smartphone Adapter for Ultima Duo. Unlike “universal” adapters, the Celestron Smartphone Adapter is custom-fit for the Ultima Duo eyepiece line. With this sturdy connection, your smartphone can capture crisp, sharp images of your favorite solar system objects. Many people are plesantly surprised by the quality of image they can get by simply aiming a smartphone camera into an eyepiece. Providing a rigid connection between the smartphone and eyepiece simply takes this to a higher level with better alignment of the optics.

Advance Planetary Imaging

Advanced planetary imagers can attach Celestron’s T-to-C Adapter and add a number of high-end imagers to Ultima Duo, including Celestron Skyris and NexImage Burst cameras. In this instance "T" and "C" are both common thread standards used with photography and video gear. Many other video camera also offer a C-thread interface.


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