Explore Scientific Focal Extender 2x - Barlow lens 1.25″
Are you looking for a reliable way to double the focal length of your telescope without compromising image quality? The Explore Scientific Focal Extender 2x Barlow lens is designed for astronomers who need sharp, high-contrast views even at high magnifications. Its telecentric optical design combined with precision-crafted lenses makes it a premium accessory for any 1.25″ focuser.
Telecentric optical design and FMC coatings
The Focal Extender uses a telecentric design that ensures uniform magnification across the entire field of view, with no unwanted aberrations at the edges. The optical system consists of four optical elements with a fully multi-coated (FMC) anti-reflection coating, which minimizes light loss and suppresses unwanted reflections. The result is an image with high contrast and accurate color rendering - especially appreciated when observing planets, the Moon, or double stars. All lenses have blackened edges that further eliminate stray light and contribute to maximum contrast.
Build quality and practical features
The Focal Extender for 1.25″ focusers has a fully metal body. Its compact dimensions make it a solid yet not overly heavy accessory.
| Parameter |
Value |
| Magnification factor |
2x |
| Barrel diameter |
1.25″ |
| Length |
100 mm |
| Maximum diameter |
48 mm |
| Weight |
258 g |
| Optical elements |
4 |
| Optical coating |
Fully Multi-Coated (FMC) |
| Eyepiece holder |
Metal compression ring |
| Filter thread |
Standard 1.25″ |
| Body material |
Metal |
Metal compression ring eyepiece holder
The eyepiece is secured by a metal compression ring, which protects the eyepiece barrel from scratches. Compared to a standard set screw, this provides a gentler and more even grip on your eyepiece.
Standard 1.25″ filter thread
The lens body includes a standard 1.25″ filter thread, so you can easily attach planetary or other 1.25″ filters without any additional adapters.
About Explore Scientific
Explore Scientific is an American brand with a long tradition in the development of astronomical optics and accessories. Their products are designed with a focus on optical quality and practical usability in the field. The Focal Extender 2x is a good example of this approach - it combines telecentric design, quality FMC coatings, and well-thought-out mechanical construction into a compact unit. It will be appreciated by beginners and experienced visual observers alike, as well as by astrophotographers.
Why choose this Barlow lens?
- Doubles the focal length of your telescope and all your 1.25″ eyepieces
- Telecentric design - uniform sharpness across the entire field of view
- 4-element optics with FMC anti-reflection coatings for high contrast and true colors
- Blackened lens edges to eliminate stray light
- Metal compression ring - safe and scratch-free eyepiece holding
- Standard 1.25″ filter thread included
- Compact and solid all-metal body
- Suitable for visual observation and astrophotography
If you want to get the most out of your eyepieces and be confident in uncompromised optical quality, this Barlow lens is an excellent choice.
