Clearance: *2nd* Antares 1.25" Extension Tube with 2.2" Extension # ET1

Our Price: $24.00

Sale Price: $16.00

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Out of Stock
Availability: Item has been discontinued by the manufacturer
Manufacturer SKU: ET1
Item Can Ship: Worldwide
Antares 1.25" Extension Tube with 2.2" Extension # ET1

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  • Antares 1.25" Extension Tube with 2.2" Extension # ET1
  • Antares 1.25" Extension Tube with 2.2" Extension # ET1
  • Antares 1.25" Extension Tube with 2.2" Extension # ET1

Product Details

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.


  • 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