Explore Scientific 3x Focal Extender Barlow lens 2″
Looking for a reliable way to significantly increase your telescope's magnification without compromising image quality? The Explore Scientific 3x Focal Extender Barlow lens in 2″ format is exactly what you need. This telecentric extender triples the effective focal length of your instrument, opening up new possibilities for both visual observation of planets and the Moon, and astrophotography with dedicated astronomy cameras.
Telecentric optical design - the key advantage
The defining technical feature of this Barlow element is its telecentric optical design, which sets professional accessories apart from average ones. Telecentric construction ensures that the output light rays are parallel to the optical axis, resulting in uniformly sharp images all the way to the edges of the field of view - without unwanted coma or spherical aberration.
In practice, this means the ES 3x Barlow genuinely preserves the potential of your quality eyepieces or astronomy camera without introducing additional optical defects. For astrophotographers, telecentric design is especially important because it eliminates focusing problems when the camera sensor is shifted along the optical axis - a common issue with standard Barlow lenses.
Compatibility and practical features
The 2″ (50.8 mm) output diameter ensures full compatibility with wide-angle eyepieces and astronomy cameras with large sensors. The package also includes a reduction adapter to 1.25″, so the Barlow works equally well with smaller eyepieces from your existing collection.
The Barlow tube is additionally equipped with a filter thread for mounting astronomy filters, which is particularly useful during planetary observing - you can filter the planet directly at the Barlow output without needing additional adapters.
Build quality and telescope compatibility
Thanks to its robust construction - weighing 770 g with dimensions of 143 x 70 mm - this is a solid and stable accessory that fits securely in any standard focuser. The Explore Scientific 3x Focal Extender is suitable for:
- Refractor telescopes
- Reflector telescopes (Newtonian and others)
- Catadioptric telescopes (SCT, Maksutov)
It is an excellent addition to any astronomy setup intended for high magnification work.
Technical specifications
| Parameter |
Value |
| Magnification factor |
3x |
| Barrel diameter |
2″ (50.8 mm) |
| Optical design |
Telecentric |
| Included adapter |
1.25″ reduction adapter |
| Filter thread |
Yes (on output tube) |
| Weight |
770 g |
| Dimensions |
143 x 70 mm |
| Compatible telescopes |
Refractors, reflectors, catadioptrics |
About Explore Scientific
Explore Scientific is an American brand with a long tradition in the manufacture of astronomical optics. It has built a strong reputation through a consistent focus on optical quality and innovative designs. Their Barlow lenses rank among the most popular in the premium accessories category and are the choice of experienced amateur astronomers and professionals around the world. The ES 3x telecentric Barlow is a clear example - a tool that genuinely delivers on its promises and takes your telescope's capabilities to a higher level without unnecessary compromises.
