It multiplies the focal length, and the eye relief survives · review
Celestron's Omni 2x: a 1.25-inch Barlow with fully multi-coated optics and blackened lens edges, which doubles each eyepiece's power while keeping its eye relief.
Celestron’s listing says something most Barlow listings leave out: the Omni 2x doubles each eyepiece’s power while keeping its eye relief.
Eye relief is how close the eye must be to the lens to see the whole field. Short eyepieces usually have little of it. A 10 mm eyepiece in this Barlow gives the power of a 5 mm, with the 10 mm’s more comfortable eye distance. For eyeglass wearers that is the main reason to own a Barlow.
Celestron’s own example: with a 25 mm and a 10 mm eyepiece, the Barlow adds the equivalents of a 12.5 mm and a 5 mm. On a 650 mm reflector that is 26x, 52x, 65x and 130x.
The optics are fully multi-coated and the lens edges are blackened. Blackening stops light that strikes the rim from scattering into the image, a small gain in contrast.
On November 7, 2026 this cost $34.99; Celestron’s X-Cel LX 2x cost $99.99 for three apochromatic elements and a brass compression ring. On a slow telescope used visually, the Omni does most of that job.
No element count, camera thread or weight in the listing; Amazon’s item data gives 80 g (2.8 oz). Celestron states a 2-year US warranty.
On November 7, 2026, Amazon.com sold it directly at $34.99.
Figures as Keepa reported them on the day this page was last updated. Stock and pricing shift without warning.
Prices quoted in this text were read on November 7, 2026. The live price is at the top of the page.
Same aisle, closest price — what the same spend else shows.
| Amplification factor | 2x, doubles the magnification of each eyepiece, stated |
|---|---|
| Element count | Not published by the maker. |
| Barrel size | 1.25 in, slides into 1.25 in focusers and diagonals and accepts 1.25 in eyepieces · threaded barrel |
| Camera thread | Not published by the maker. |
| Effect on eye relief | Keeps the eye relief of the eyepiece while doubling its power, stated |
| Coatings | Fully multi-coated optics with blackened edges |
| Body | Threaded 1.25 in barrel |
| Weight | Not published in the listing text · Amazon's item data gives 80 g (2.8 oz) |
| Amazon reference | B00008Y0TM |
| EAN | 0050234933261 |
As many as you have eyepieces. Celestron's example: with a 25 mm and a 10 mm, adding the Barlow gives four choices, the 25 mm, the 10 mm, the 25 mm doubled (like a 12.5 mm) and the 10 mm doubled (like a 5 mm).
Short eyepieces usually make you press your eye close to a small lens. A 10 mm in a 2x Barlow gives the power of a 5 mm while keeping the 10 mm's eye distance, which is far more comfortable, especially with glasses.
They stop light that hits the rim of the lens from bouncing into the image. The result is slightly better contrast, which shows on planets.
This model is listed on Amazon.com, at ≈ $35 at the last reading. Listed is not the same as in stock: availability changes daily, and the buy box shows the live price.
Details checked on November 7, 2026.
A first Barlow for an existing 1.25-inch eyepiece set
Listed because the eyepiece or part names this scope.
Amazon reports what buyers took in the month before this page was last checked: at least 300.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for telescopes and observing optics and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
2x Barlow · 2 in barrel · ED glass · multi-coated · 2 in filter thread · 1.25 in adapter included
A 2-inch 2x Barlow in ED glass with multi-coated surfaces, a 2-inch filter thread and a 2-to-1.25-inch adapter, so both eyepiece sizes can be doubled.
Best for: A 2-inch focuser and wide-field 2-inch eyepieces that no 1.25-inch Barlow can take
≈ $63
3x Barlow · 1.25 in · apochromatic glass · M42 × 0.75 male thread · 1.25 in filter thread
A short 1.25-inch 3x Barlow in CNC-machined aluminum with apochromatic glass, multi-coated optics, a 1.25-inch filter thread and an M42 × 0.75 thread that takes a camera T-ring.
Best for: A short-focus telescope that needs planetary magnification, or a camera that cannot otherwise reach focus
≈ $24
2x Barlow · 1.25 in · apochromatic glass · M42 × 0.75 male thread · 1.25 in filter thread
A short 1.25-inch 2x Barlow in CNC-machined aluminum with apochromatic glass, multi-coating, a filter thread and an M42 × 0.75 thread for a camera T-ring.
Best for: A first Barlow that will also carry a camera, on a telescope that struggles to reach focus
≈ $19
