It multiplies the focal length, and the eye relief survives · review
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.
A Barlow sits between the focuser and the eyepiece and doubles the telescope’s focal length. A 1.25-inch Barlow only takes 1.25-inch eyepieces. Owners of 2-inch focusers who buy wide-field 2-inch eyepieces need a 2-inch Barlow, and this is one.
An adapter from 2 to 1.25 inch is in the box, so smaller eyepieces can be doubled too.
Astromania states ED (extra-low-dispersion) glass and multi-coating on all lens surfaces. ED glass keeps the colors focused together, which shows as less purple fringe on the Moon’s limb and bright planets. The listing does not give the element count or the glass type.
The lower barrel and the adapter both carry a 2-inch filter thread. A Moon, UHC or O-III filter screwed there filters every eyepiece placed in the Barlow, instead of being moved from one eyepiece to the next.
The listing pitches it for planetary imaging, where extra focal length makes small planets larger on the sensor, and says it shows no shadowing on small camera chips.
Amazon’s item data gives 325 g (11.5 oz). On a light single-speed focuser with a heavy 2-inch eyepiece in it, that load is noticeable.
On November 7, 2026, Amazon.com listed it at about $63 from a third-party seller.
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, stated |
|---|---|
| Element count | Not published by the maker · ED glass stated |
| Barrel size | 2 in · a 2-to-1.25-inch adapter is included so 1.25 in eyepieces can be used as well |
| Camera thread | Not published by the maker. |
| Effect on eye relief | Not published by the maker. |
| Coatings | All lens surfaces multi-coated, stated |
| Body | Textured high-grip exterior stated usable with gloves · 2 in filter thread on the lower barrel and on the adapter |
| Weight | Not published in the listing text · Amazon's item data gives 325 g (11.5 oz) |
| Amazon reference | B0140UAHM6 |
| EAN | 6970019290409 |
Only if your telescope has a 2-inch focuser and you use, or plan to use, 2-inch eyepieces. A 1.25-inch Barlow cannot take them. With the included adapter, this one also doubles 1.25-inch eyepieces.
Extra-low-dispersion glass bends colors more evenly, so the Barlow adds less false color around bright planets and the Moon's limb. Astromania states ED glass without naming the type or the number of elements.
Astromania says no shadowing is visible on small camera sensors, which is what a planetary camera uses. A large sensor needs testing.
This model is listed on Amazon.com, at ≈ $63 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 2-inch focuser and wide-field 2-inch eyepieces that no 1.25-inch Barlow can take
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.
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
2x Barlow · 1.25 in (31.8 mm) · two-lens design · for observing and photography
Bresser's 2x Barlow in a 1.25-inch (31.8 mm) barrel, described on Amazon.com as a two-lens design for observing and photography, with a black lens cell and silver barrel.
Best for: An owner of Bresser eyepieces who wants a matching 2x and accepts a thin specification
≈ $98
