Barlow GSO triplet 2,5X View larger

GSO 1.25" 2.5x Apochromatic Barlow Lens

Barlow GSO triplet 2,5X

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GSO 1.25" 2.5x Apochromatic Barlow Lens

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GSO 1.25" 2.5x Apochromatic Barlow Lens

Quick Overview

  • GSO's 1.25" 2.5x fully apochromatic Barlow increases the magnification of each eyepiece and effectively doubles the number of eyepieces at your disposal
  • Low profile maintains a comfortable viewing position
  • Air-spaced, three-element, fully-multicoated ED lenses with excellent color correction, sharpness, and image brightness
  • Precision-machined aluminum barrel with high-quality black-anodized finish and knurled ring to aid in handling

Product Details

If you need more power than your eyepieces alone can provide, we offer a new apochromatic 2.5x Barlow lens from GSO (Guan Sheng Optical) to give a big magnification boost to any 1.25" eyepiece it's used with.

Nothing has been compromised in GSO's latest and finest offering. This Barlow features an air-spaced, three-element, apo design with fully multicoated optics. The housing is precision machined from aluminum stock and black anodized to a hard finish. The lens edges and inner barrel are blackened to provide maximum contrast. The Barlow body includes a brass compression ring so that your eyepiece barrels are not marred by the captive set screw. The 2.5x model has a clear aperture of 23mm. For those who need a very high quality Barlow for all-round use, the 2.5x barlow is a very nice step up from the typical 2x achromatic barlows commonly found on the market.


  • Barrel size = 1.25" (31.7mm)
  • Magnification factor = 2.5x
  • Weight = 3.5oz (99gm)
  • Total height = 2.95" (75mm)
  • End caps = 2
  • 1.25" filter threads on bottom of barlow: No
  • Made in Taiwan