Blue Fireball 2" Eyepiece Extension Tube with 80mm (3.15") Extension
Ships by Next Business Day
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.
New, improved design - Now with two large thumbscrews!
This high-quality Blue Fireball extension tube can be inserted into any 2" telescope focuser to gain an additional 80mm (3.15") of back-focus travel. With this, eyepieces and accessories that you may not have been able to use because your telescope tube was too short are usable again!
Lack of sufficient back-focus travel is a common problem with many of today's fast f-ratio telescopes, especially if you have a low profile focuser or a short telescope tube that is optimized for binoviewer viewing. The 80mm extension tube alleviates this problem. This tube can also be used with 1.25" accessories with the use of commonly available 1.25"-2" adapters (sold separately).
This practical and superb quality adapter is made from precision machined aluminum and is black anodized. It includes a brass compression ring that clamps around the inserted eyepiece or accessory. Because the set-screw does not come in direct contact with your eyepiece or diagonal, their barrel will not be scratched or dented. The inside surface of this tube is black-matted to enhance contrast by reducing stray light reflections and is threaded to accept standard 2" telescope filters. 2" barrel is smooth sided.
Specifications:
- Total length = 115mm (4.53")
- Extension provided = 80mm (3.15")
- Insertion depth = 66mm (2.60")
- Maximum outside diameter (excluding thumbscrews) = 62mm (2.44")
- Weight = 6.4 oz.
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Hide Found a better Shipped Price on Frontend? | No |
New, improved design - Now with two large thumbscrews!
This high-quality Blue Fireball extension tube can be inserted into any 2" telescope focuser to gain an additional 80mm (3.15") of back-focus travel. With this, eyepieces and accessories that you may not have been able to use because your telescope tube was too short are usable again!
Lack of sufficient back-focus travel is a common problem with many of today's fast f-ratio telescopes, especially if you have a low profile focuser or a short telescope tube that is optimized for binoviewer viewing. The 80mm extension tube alleviates this problem. This tube can also be used with 1.25" accessories with the use of commonly available 1.25"-2" adapters (sold separately).
This practical and superb quality adapter is made from precision machined aluminum and is black anodized. It includes a brass compression ring that clamps around the inserted eyepiece or accessory. Because the set-screw does not come in direct contact with your eyepiece or diagonal, their barrel will not be scratched or dented. The inside surface of this tube is black-matted to enhance contrast by reducing stray light reflections and is threaded to accept standard 2" telescope filters. 2" barrel is smooth sided.
Specifications:
- Total length = 115mm (4.53")
- Extension provided = 80mm (3.15")
- Insertion depth = 66mm (2.60")
- Maximum outside diameter (excluding thumbscrews) = 62mm (2.44")
- Weight = 6.4 oz.
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Hide Found a better Shipped Price on Frontend? | No |
Blue Fireball 2" Eyepiece Extension Tube with 80mm (3.15") Extension # X-05