Celestron Luminos 2.5x Barlow lens 1.25″/2″
If you are looking for a reliable, optically excellent focal length multiplier capable of handling both visual observing and planetary video astronomy, the Celestron Luminos 2.5x Barlow lens is a choice that will not disappoint. It belongs to the premium Luminos series, which at Celestron is synonymous with careful craftsmanship and high optical quality at a reasonable price.
Optics and build quality
At the heart of this Barlow lens is a 4-element optical system with full multi-coated optics (FMC - Fully Multi-Coated). This maximizes light transmission and keeps image contrast high even when used with demanding eyepieces. The 28 mm clear aperture ensures that the Barlow will not cause vignetting even with wide-field eyepieces that have a larger lens diameter. The body is elegant and sturdy - a brass compression ring secures eyepieces safely and precisely centered without scratching the eyepiece barrel.
Universal compatibility - 2″ and 1.25″
The Barlow is primarily designed for a 2″ (50.8 mm) focuser, but a 1.25″ adapter is included in the package. This means it can be used without any issues with eyepieces of both standard diameters - whether you have an older set of 1.25″ eyepieces or modern 2″ wide-field eyepieces, the Luminos Barlow serves equally well in both cases.
The 2.5x magnification factor is a practical choice - it offers noticeably more magnification than a classic 2x Barlow, while still preserving sufficient brightness and usable eye relief with most eyepieces.
Planetary video astronomy and lucky imaging
The Celestron Luminos Barlow 2.5x is an excellent choice for planetary video astronomy - that is, for use with planetary cameras (ZWO, Player One, QHY and similar) when imaging Jupiter, Saturn or the Moon using the lucky imaging method. The 28 mm clear aperture easily covers the sensor of common planetary cameras, and the 4-element optics minimize chromatic aberration even at high magnifications.
Why choose the Celestron Luminos Barlow?
- 4-element optical system with FMC coatings for maximum contrast and light transmission
- 28 mm clear aperture - no vignetting with wide-field eyepieces
- 2.5x magnification factor - more power than a standard 2x Barlow
- Fits 2″ focusers, 1.25″ adapter included
- Brass compression ring for secure, scratch-free eyepiece retention
- Suitable for visual observing and planetary imaging alike
Technical specifications
| Parameter |
Value |
| Magnification factor |
2.5x |
| Barrel diameter |
2″ (50.8 mm), with 1.25″ adapter included |
| Optical design |
4-element |
| Coatings |
FMC - Fully Multi-Coated |
| Clear aperture |
28 mm |
| Eyepiece retention |
Brass compression ring |
| Series |
Celestron Luminos |
Summary
The Luminos series from Celestron represents a well-thought-out balance between professional quality and affordability. Premium FMC anti-reflection coatings, robust brass mechanical components and versatility thanks to the included adapter set make this Barlow a truly versatile tool for every passionate amateur astronomer. Whether you observe visually, photograph planets with a camera or experiment with various eyepieces from your collection, the Celestron Luminos Barlow 2.5x will reliably expand the capabilities of your telescope without any compromise in optical quality.
