2″ to 2″ 50 mm Extension Tube
Different telescopes focus at very different distances. Many optical designs deliberately place the focal plane further back to make it easier to attach a camera or other accessories. Refractors, in particular, are usually designed to be used with a star diagonal or erecting prism - and without one, the focuser simply cannot travel far enough to reach focus.
If you try to focus a refractor without a diagonal or prism, you will often hit the same problem: the focuser runs out of travel before the image in the eyepiece becomes sharp. This extension tube solves the problem - it adds exactly the optical length you are missing, so you can reach focus without any compromise.
Solid build, secure grip
The tube is machined from solid aluminium with a black anodised finish that absorbs stray light inside the barrel. A brass compression ring holds your eyepiece or accessory firmly in place - without any risk of scratching. Your eyepiece stays perfectly on the optical axis, even during a long observing session. The 2″ barrel also features a safety groove, which prevents it from slipping out of the focuser accidentally.
Key specifications
| Parameter |
Value |
| Format |
2″ to 2″ |
| Length |
50 mm |
| Body material |
Aluminium with black anodised finish |
| Grip mechanism |
Brass compression ring |
| Safety groove |
Yes |
Who is this for?
This extension tube is a practical solution for anyone using a refractor without a star diagonal. It is also useful when connecting a camera directly to the focuser, or when any other accessory requires a longer optical path to reach focus. One small addition that makes a real difference to your observing setup.
