Celestron 1.25" & 2" Ultima Duo Eyepiece with T Thread - 21mm
Availability: Item has been discontinued by the manufacturer
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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.
PERFECT FOR IMAGING
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 42mm 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 (not included) 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 Celestron's Smartphone Adapter for Ultima Duo (sold separately). 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 (sold separately) and add a number of high-end imagers to Ultima Duo, including Celestron's Skyris and NexImage Burst cameras.
SMART DESIGN FOR USE IN THE FIELD
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 (but not 2" 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.
Product carries full 2 year Celestron factory limited warranty (within US/Canada only).
| Product Banner Type | discontinued |
|---|---|
| Free Shipping Graphic | Free US Shipping |
| Eyepiece Series | Ultima Duo |
| Focal Length | 21mm |
| Barrel Size | 1.25" (31.7mm) and 2" (50.8mm) |
| Apparent Field of View (Mfg Specified) | 68° |
| Eye Relief (Designed) | 20mm |
| Filter Threads | Standard 1.25" Filter Thread (M28.5 x 0.6) |
| Coatings | Fully Multi-Coated |
| Lens Elements | 8 |
| Lens Groups | 5 |
| Blackened Lens Edges | Yes |
| Barrel Type | With safety undercut |
| Protective Plastic Storage Container | Yes - Free Agena Eyepiece Container |
| Protective Plastic Storage Container Size | Agena 65x80mm |
| Height (With Eyeguard Extended) | 105mm (4.13") |
| Maximum Width | 57.5mm (2.26") |
| End Caps | 2 |
| Eye Lens Diameter | 30mm (1.18") |
| Rubber Eye Guard | Yes |
| Warranty | Full 2-year manufacturer's limited factory warranty (within US/Canada only). |
| Weight | 13 oz (368.54 g) |
| Misc. Information | 42mm T-Threads under eyecup |
| Hide Found a better Shipped Price on Frontend? | No |
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.
PERFECT FOR IMAGING
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 42mm 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 (not included) 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 Celestron's Smartphone Adapter for Ultima Duo (sold separately). 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 (sold separately) and add a number of high-end imagers to Ultima Duo, including Celestron's Skyris and NexImage Burst cameras.
SMART DESIGN FOR USE IN THE FIELD
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 (but not 2" 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.
Product carries full 2 year Celestron factory limited warranty (within US/Canada only).
| Product Banner Type | discontinued |
|---|---|
| Free Shipping Graphic | Free US Shipping |
| Eyepiece Series | Ultima Duo |
| Focal Length | 21mm |
| Barrel Size | 1.25" (31.7mm) and 2" (50.8mm) |
| Apparent Field of View (Mfg Specified) | 68° |
| Eye Relief (Designed) | 20mm |
| Filter Threads | Standard 1.25" Filter Thread (M28.5 x 0.6) |
| Coatings | Fully Multi-Coated |
| Lens Elements | 8 |
| Lens Groups | 5 |
| Blackened Lens Edges | Yes |
| Barrel Type | With safety undercut |
| Protective Plastic Storage Container | Yes - Free Agena Eyepiece Container |
| Protective Plastic Storage Container Size | Agena 65x80mm |
| Height (With Eyeguard Extended) | 105mm (4.13") |
| Maximum Width | 57.5mm (2.26") |
| End Caps | 2 |
| Eye Lens Diameter | 30mm (1.18") |
| Rubber Eye Guard | Yes |
| Warranty | Full 2-year manufacturer's limited factory warranty (within US/Canada only). |
| Weight | 13 oz (368.54 g) |
| Misc. Information | 42mm T-Threads under eyecup |
| Hide Found a better Shipped Price on Frontend? | No |