DO-GSO ED Barlow-lens 3x 1,25 inch

When you need to push your telescope’s magnification for lunar detail or tight double stars, this 3x ED Barlow lens threads into your 1.25" focuser and immediately triples the effective focal length of any eyepiece. The extra-low dispersion glass keeps false colour at bay, so the view stays sharp and high-contrast even at high power.

Key specifications

• Magnification factor: 3x
• Optical design: ED (extra-low dispersion) glass, 2 elements in 1 group
• Barrel size: 1.25" (31.7 mm)
• Optical coatings: fully multi-coated (FMC)
• Housing: anodized aluminium
• Eyepiece holder: brass compression ring
• Filter threads: standard 1.25" (M28.5x0.6)
• Colour: black

Why choose it

The ED glass element significantly reduces chromatic aberration compared to standard Barlows, so bright objects like Jupiter or the Moon show less colour fringing. The fully multi-coated surfaces maximise light transmission, and the brass compression ring holds eyepieces securely without scratching their barrels. The built-in filter threads let you stack a 1.25" filter directly onto the Barlow for convenient use.

Ideal use cases

• High-magnification lunar and planetary observation
• Doubling or tripling the power of your existing eyepiece collection
• Astrophotography with appropriate adapters (e.g., for planetary imaging)
• Use with any 1.25" telescope focuser or diagonal

Good to know

The Barlow lens has an optical aperture of approximately 20 mm, which is sufficient for most 1.25" eyepieces. It is compatible with all standard 1.25" accessories and is a simple, robust way to expand your magnification range without buying additional eyepieces.