Antares 1.25" 3x Barlow Lens # B3S

Our Price: $35.00
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Our Product ID: OBAR-AN-B3S
Manufacturer SKU: B3S
Item Can Ship: Worldwide
Antares 1.25" 3x Barlow Lens # B3S

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Product Details

This high performance Antares barlow # B3S triples the power of any inserted eyepiece. It features a fully-multicoated achromatic design, internal darkening and edge-blackened lenses. Suitable for high contrast, high power applications in any telescope, although it is best suited to Newtonian/Dobsonian reflector telescopes because of its rather long length. Not threaded to accept standard 1.25" astronomy filters. Made in Canada.


  • Barrel size: 1.25" / 31.7mm
  • Magnification factor: 3x
  • Type: Achromatic
  • Coatings: Fully multicoated
  • Clear aperture = 1" / 25.3mm
  • Weight: 3.2oz / 91g
  • Total length: 4.48" / 113.9mm
  • Length of lower chrome barrel: 1.55" / 39.4mm
  • Length of upper black barrel: 2.94" / 74.6mm
  • Filter threads: No
  • End caps: Yes (2) but subject to change without notice
  • Country: Made in Canada

Note that the use of any optical element like barlows and focal reducers changes the focus point of your telescope, requiring additional in-focus or out-focus travel. The exact amount of focus travel required will depend on the optics and mechanics of your specific set-up (telescope, diagonal (if used), barlow, and eyepiece). Hence, be aware that you may not be able to reach focus with all eyepieces or in all configurations with a given barlow.

Manufacturer Antares
Size Format 1.25 inch
Magnification Factor 3x
Number of Lens Elements 2
Lens Coatings Fully multicoated
Total Length 4.48 inches / 113.9 mm
Length of Nosepiece 1.55 inches / 39.4 mm
Outside Length of Upper Body 2.94 inches/74.6 mm
Insertion Depth
Max Diameter Excluding Thumbscrew
Clear Aperture 1 inches / 25.3 mm
Weight 3.2 oz / 91 g
Barlow Lens Cell Removable No
Filter Threads at Bottom of Barlow Cell No
Filter Threads Between Barlow Cell and Tube N/A
Barrel Type Smooth-sided
Compatible Agena Bolt Case (with Screw Removed)
Compatible Bolt Case (with Screw Attached)
Number of Thumbscews 1
Thumbscrew Thread Specification Coming Soon
End Caps (Subject to change without notice)
Compression Band/Ring in Eyepiece Holder No
Country of Manufacture Canada