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Antares 1.25" Extension Tube with 2.2" Extension # ET1

4.8 (5 Reviews) Read Reviews Write Review
Brand Antares
Part Number ET1
Availability available

Product Info

Manufacturer Description

Important Note: Brand new item as received from Antares. The 1.25" eyepiece holder seems to be just slightly undersized. It worked with all six 1.25" barrels we tested it with. Most went in easily and smoothly as they should. However, a couple needed a bit of coaxing and care to insert, but again, they all worked. Closeout, so all sales are final.

Antares' 1.25" Extension Tube # ET1 adds 56.5mm (2.22") of back-focus travel to your telescope focuser. It fits standard 1.25" eyepiece tubes in telescopes and accessories like diagonals. With this, eyepieces and accessories that you may not have been able to use because your focuser tube was too short are usable again The adapter is precision machined from aluminum and black anodized, and threaded to accept standard 1.25" astronomy filters.

Note that Antares uses a fat thumbscrew on this item at the top, and this extends a bit above the top of adapter. So if you have a very wide eyepiece or accessory, the screw may get in the way and prevent the inserted item from going in all the way into the adapter. Typical Antares production quality - works well but a bit rough in finish.

Specifications:

  • Total Length = 3.35" (85mm)
  • Outside Length of Upper 1.25" Barrel = 2.22" (56.5mm)
  • Length of Lower 1.25" Barrel = 1.12" (28.5mm)
  • Thread Specification (Telescope End) = M28.5x0.6 Female
  • Made in Canada

Reviews

4.8 (Based on 5 Reviews) 100% of reviewers recommended this product.
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    1. Guest

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      User Notes:
      Review by mike b.
      1487012370
      Feb 13, 2017

      4.0 antares 1.25" extension

      Pros:

      Cons:

      Comments:

      works well, snug fit.

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

      This review was provided courtesy of AgenaAstro.com

    2. Guest

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      Review by Bernal M.
      1482679950
      Dec 25, 2016

      5.0 Antares 1.25" extension tube

      Pros:

      Cons:

      Comments:

      Works awesome.

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

      This review was provided courtesy of AgenaAstro.com

    3. Guest

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      Review by Michael R.
      1482589677
      Dec 24, 2016

      5.0 Great product!

      Pros:

      Cons:

      Comments:

      This extension tube is exactly what I needed and the quality is excellent and Agena Astro Products service was excellent as well. Great products at reasonable prices.

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

      This review was provided courtesy of AgenaAstro.com

    4. Guest

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      User Notes:
      Review by Don K. of Vista, CA.
      1422662400
      Jan 30, 2015

      5.0 Adds More Capability for Faster Scopes

      Pros:

      Easy to Use,Lightweight,Strong Construction

      Cons:

      Comments:

      I own a short focus Newtonian (f4) and even with a 2x Barlow higher magnifications are hard to achieve. By placing an eyepiece into this extension first and then placing the entire combination into the Barlow, it gives me approximately 2.8x magnification. My favorite 17mm eyepiece now gives me 74x which in my scope is in a sweet spot for most of my observing needs. My 10mm now gives 126x which is good for a lot of closer doubles, the Moon, and the planets. It does result in the eyepiece sticking out further from the focuser, but I don't care. For me this is the best accessory I've ever purchased and has made my scope more versatile.

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

      This review was provided courtesy of AgenaAstro.com

    5. mhuston6

      mhuston6 New Member

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      User Notes:
      1178718060
      May 9, 2007

      5.0 Antares Extension Tube - 1.25"

      Pros:

      Does the job at a great price!!

      Cons:

      Nothing bad to mention about the extension!!

      Comments:

      This extension is just what you need for the extra focus travel!! Unless you want to hold the eyepiece out of the focuser :-) Works with any telescope, but is a must for reflectors at close range!!

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