Celestron Ultima Duo 17mm Eyepiece

Product code: 93444
High performance photo-visual eyepieces quickly switch between observing and imaging
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Celestron Ultima Duo 17mm Eyepiece

New Celestron Ultima Duo Eyepieces - Now Available!

The new Celestron Ultima Duo eyepieces fit both 1.25 and 2 inch focusers and are perfect for either visual and or a-focal astrophotography (via the telescope eyepiece) of brighter objects such as planets and lunar.  Camera connection is made easy by an integrated 42mm t-adaptor underneath the rubber eye guard, and the eyepiece barrel is also threaded for filters.
Fully multi-coated optics, 8 elements in 5 groups, optimised for correction of chromatic aberration and field curvature. Internal baffling and blackened lens edges reduce internal reflections and maximise contrast. 

Celestron Ultima Duo Product Description

Get a new perspective on the Universe with Ultima Duo, Celestron's versatile new eyepieces that combine excellent optics with a built-in T-adapter for astroimaging.

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.


If you’re interested in imaging through the eyepiece, Ultima Duo makes the process quick and easy. 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 the Moon and planets is even easier with our 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.

Advanced planetary imagers can attach Celestron’s T-to-C Adapter and add a number of high-end imagers to Ultima Duo, including our Skyris and NexImage Burst cameras.


Ultima Duo’s anodized aluminum body allows it to fit both 1.25” and 2” focusers, so you can use it with almost any telescope with no extra adapters required. A compact body style makes Ultima Duo an excellent choice for use with binoviewers.

The rubber grip rings provide good ergonomics so you can hold onto your eyepiece, even while wearing gloves. The aluminum barrel is threaded to accept 1.25” eyepiece filters and has a safety recess to prevent it from slipping out of the focuser. Each Ultima Duo eyepiece includes cover caps and a protective carry pouch.

Celestron Ultima Duo is available in 6 focal lengths

5 mm
8 mm
10 mm
13 mm
17 mm
21 mm
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MPN 93444
GTIN 050234934442
EAN 50234934442
Product Code 93444
Brand Celestron
Condition New