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Antares 1.25" 3x Barlow Lens with Twist-Lock Adapter and T-Thread # UB3STL

5.0 (1 Reviews) Read Reviews Write Review
Brand Antares
Part Number UB3STL
Availability available

Product Info

Manufacturer Description

This high performance Antares barlow # UB3STL triples the power of any inserted eyepiece. It features a fully-multicoated achromatic design. This short barlow will work in diagonals or reflectors, has internal darkening and edge-blackened lenses, and is parfocal with most eyepieces. It features a clear aperture of 27mm. Suitable for high contrast, high power applications in any telescope. Made in Canada.

This new version of Antares' popular UB3S barlow features an integrated twist-lock adapter / clamping mechanism to securely center and hold your eyepiece. The inner compression ring is made of polypropylene and will not mar your eyepieces. Unscrewing the twist-lock ring exposes a standard male T-thread (M42x0.75) underneath which can be used to couple imaging devices with the barlow.


  • Barrel size: 1.25" / 31.7mm
  • Magnification factor: 3x
  • Type: Achromatic
  • Coatings: Fully multicoated
  • Clear aperture = 1.01" / 25.7mm
  • Weight: 5.5oz / 156g
  • Total length: 3.31" / 84mm
  • Length of lower chrome barrel: 1.52" / 38.5mm
  • Length of upper black barrel: 1.79" / 45.5mm
  • 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.


5.0 (Based on 1 Reviews) 100% of reviewers recommended this product.
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    1. Guest

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      User Notes:
      Review by Russ the scope dope ! of AZ valley of the sun.
      Apr 13, 2013

      5.0 I love this barlow!


      Lightweight,Quality Lenses,Easy to Use,Accurate,Strong Construction




      I use this Antares 3x barlow in my 70mm, 90mm and 127mm refractors. It gives excellent crisp views. Am able to use longer FL eyepieces to view many objects, especially lunar and planetary.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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