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Antares 1.25" 3x Barlow Lens # UB3S

4.3 (4 Reviews) Read Reviews Write Review
Brand Antares
Part Number UB3S
Availability available

Product Info

Manufacturer Description

This high performance Antares barlow # UB3S 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. Suitable for high contrast, high power applications in any telescope. Not threaded to accept standard 1.25" astronomy filters. Made in Canada.

Specifications:

  • Barrel size: 1.25" / 31.7mm
  • Magnification factor: 3x
  • Type: Achromatic
  • Coatings: Fully multicoated
  • Clear aperture = 1.06" / 27mm
  • Weight: 4oz / 113g
  • Total length: 3.18" / 80.8mm
  • Length of lower chrome barrel: 1.49" / 37.8mm
  • Length of upper black barrel: 1.69" / 42.9mm
  • 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.

Reviews

4.3 (Based on 4 Reviews) 100% of reviewers recommended this product.
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    1. Guest

      Skill Level
      Unknown
      Time with Product
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      User Notes:
      Review by AstroKid of U.S..
      1465084800
      Jun 4, 2016

      5.0 A definite keeper...

      Pros:

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

      Cons:

      Comments:

      With a 6" f/5 Newtonian, and an average ocular, I witnessed an instance of snap-to focussing with this barlow, and for the first time with any of my telescopes, including a Takahahsi FS-102. It's definitely a keeper!

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

      This review was provided courtesy of AgenaAstro.com

    2. Tank

      Tank New Member

      Skill Level
      Unknown
      Time with Product
      Unknown
      User Notes:
      1249477380
      Aug 5, 2009

      4.0 x3 barlow

      Pros:

      Solid construction; Great views; So far can't see how it can get much better

      Cons:

      None that I've encountered

      Comments:

      I picked up this barlow at a very cheap price. I think it works very well, although I have not compared it to any other barlow. I have used it with my 12mm T4 Nagler giving me x300 mag, which gave me great views of Jupiter and Saturn, and even some DSOs. Solidly made fit and finish.

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

      melonman New Member

      Skill Level
      Unknown
      Time with Product
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      User Notes:
      Review by melonman of Minnesota.
      1227139200
      Nov 19, 2008

      4.0 The Antares UB3S Achromatic Barlow

      Pros:

      Reasonable price,Decent Barlow

      Cons:

      The GSO is less expensive,Others may be better

      Comments:

      The Antares UB3S Barlow is a well constructed 3.15 inch (80mm) long 1.25 inch barlow. It has green coatings on its lenses with a higher level of reflection, however, than the GSO Barlows. It requires about 5 mm out focus with my eyepieces just the opposite of my Meade 2x barlow whereas my 2x GSO is nearly par focal.

      Like my other barlows, it cleans up the edges of inexpensive wide field eyepieces while increasing power. I bought it because at the time, it was one of the least expensive 3x quality barlows available and could make a good low power plossl that I had with good eye relief into a high (220X-230X) power eyepiece. You cannot expect to unscrew the bottom of this barlow and attach it directly to an eyepiece like you can a GSO. It provides sharp views, but from what I have read not as sharp as Televue barlows and comparing it to my GSO and Meade 2X, my feeling is that it is of similar quality.

      Barlows like this are simple and other than coatings and lens polishing, it is hard to find differences anymore. When looking at the Trapezium in Orion for example, I noticed both the stars and spaces between them, were 3X larger. A 3X higher powered eyepiece seemed to have more pinpoint stars about twice the size of the same stars in the eyepiece I had just barlowed.

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

      This review was provided courtesy of AgenaAstro.com

    4. melonman

      melonman New Member

      Skill Level
      Unknown
      Time with Product
      Unknown
      User Notes:
      1168210800
      Jan 7, 2007

      4.0 The Antares UB3S Achromatic Barlow

      Pros:

      A decent Barlow at a reasonable price.

      Cons:

      Some barlows may be better. The GSO is less expensive

      Comments:

      The Antares UB3S Barlow is a well constructed 3.15 inch (80mm) long 1.25 inch barlow. It has green coatings on its lenses with a higher level of reflection however than the GSO Barlows and says Japan on it. It requires about 5 mm out focus with my eyepieces just the opposite of my Meade 2x barlow where as my 2x GSO is nearly par focal.

      Like my other barlows, it cleans up the edges of inexpensive wide field eyepieces while increasing power. I bought it because at the time, it was one of the least expensive 3x quality barlows available and could make a good low power plossl that I had with good eye relief into a high (220X-230X) power eyepiece. You cannot expect to unsrew the bottom of this barlow and attach it directly to an eyepiece like you can a GSO. It provides sharp views, but from what I have read not as sharp as Televue barlows and comparing it to my GSO and Meade 2X, my feeling is that it is of similar quality.

      Barlows like this are simple and other than coatings and lens polishing, It is hard to find differences anymore. when looking at the trapezium in Orion for example, I noticed both the stars and spaces between them, were 3X larger. A 3X higher powered eyepiece seemed to have more pinpoint stars about twice the size of the same stars in the eyepiece I had just barlowed.

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