DeltaOptical Barlow lens 5x 1.25″
Looking for a way to significantly increase the magnification of your telescope without buying a whole new set of eyepieces? The DeltaOptical Barlow lens 5x for 1.25″ focusers is exactly what you need. With its fivefold focal length extension, it turns you into a true hunter of planetary details and lunar features - all with a surprisingly compact and affordable accessory.
Optical design
At the heart of this Barlow multiplier is an achromatic optical system consisting of 3 lenses arranged in 1 group. The achromatic correction suppresses chromatic aberration, which is absolutely critical at such high magnification - without it, details on planets would blur into colorful, fringe-smeared objects. All optical surfaces are coated with a fully multi-coated (FMC) anti-reflection coating, which minimizes unwanted reflections, increases contrast and light transmission. The result is a sharp, high-contrast image even at maximum magnification.
Planetary observation and astrophotography
The 5x Barlow multiplier is an excellent choice for planetary astrophotography - when used with a planetary camera (e.g. ZWO, Player One or similar), it allows you to achieve the high effective focal length needed to capture surface details of Mars, the cloud bands of Jupiter, or the rings of Saturn.
It works equally well for visual observation as an extension of your eyepiece collection. By inserting the Barlow into your focuser, you instantly multiply the magnification of any existing eyepiece by five - effectively turning one eyepiece into two, with the second being significantly more powerful.
Compatibility and practical use
The lens is designed for standard 1.25″ focusers, which are today the most widespread format for amateur telescopes of all types - refractors, reflectors and catadioptric systems. The weight of 160 g is well-balanced, so mounting it on the focuser does not cause unwanted strain or balance shifts on the mount.
For best results, we recommend using this Barlow lens under conditions of good atmospheric stability (good "seeing"), when high magnification will truly reveal the level of detail it is capable of delivering.
Technical specifications
| Parameter |
Value |
| Magnification factor |
5x |
| Barrel diameter |
1.25″ |
| Optical design |
Achromatic, 3 elements in 1 group |
| Lens coating |
FMC (Fully Multi-Coated) |
| Weight |
160 g |
| Compatible telescope types |
Refractors, reflectors, catadioptric systems |
Summary
The DeltaOptical Barlow 5x 1.25″ is a practical and versatile accessory that expands the capabilities of your telescope at a reasonable price. Whether you are a beginner planetary observer or an experienced astrophotographer looking for a compact multiplier for planetary imaging, this lens will reliably deliver optical quality you can count on.
