Blue Fireball 2" to 1.25" Twist Lock Self Centering Eyepiece Adapter # E-11

Our #: PAAR-BF-E-11
Mfg #: E-11
Our Price: $27.95
Free shipping for this item in the US
More Info

Contiguous US Customers:
All items we sell ship for free within the Contiguous US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.

US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.

International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.

Out of Stock
Availability: Expected mid-April

Product Details

This popular eyepiece adapter allows 1.25" eyepieces and accessories to be used in 2" focusers, diagonals and barlows. Instead of a conventional locking thumbscrew that can push the eyepiece to one side, this innovative adapter uses a helical compression mechanism to not only grip the inserted eyepiece securely, but also center the eyepiece accurately within the adapter in the process. This mechanism is easily tightened or loosened by turning the large knurled twist lock ring at the top of the adapter.

The helical centering mechanism is controlled by an inner polypropylene compression ring (or collet) that will not mar your eyepieces. Its long length ensures that the adapter works well with smooth and recessed eyepiece barrels.

This practical and superb quality adapter is made from precision machined aluminum and is black anodized. The inside surface of this tube is black-matted to enhance contrast by reducing stray light reflections. It is also threaded to accept standard 2" telescope filters so you can use your 1.25" eyepieces with your 2" filters (be careful not to let the eyepiece barrel hit the filter though; To alleviate this problem, you can attach a 2" spacer ring (not included) to the Twist-Lock adapter to increase its overall length).

Specifications (Complete adapter):

  • Total height = 1.20" (30.6mm)
  • Weight = 2.8oz (79g)
  • Compression band length = Approx. 16.5mm (0.65")
  • Maximum diameter = 2.2" (55.8mm)

Specifications (2" lower spacer part only):

  • Total height = 1.03" (26.1mm)
  • Optical length = 0.08" (2.15mm)
  • Clear aperture = 1.25" (31.7mm)
  • Weight = 2oz (57g)
  • Threads = M48x0.75 male and female

Manufacturer part number: E-11

Other Information

  • Country of Manufacture: Taiwan