Astromania 2 Inch Telescope Eyepiece Extension Tube Adapter Optical Length 50mm with Standand Filter Threads

Fits in 2 inch telescope focusers and accepts 2 inch eyepieces or accessories; threaded for use with standand 2-Inch astrophotography filters Features two locking thumbscrews to secure any inserted astronomy accessory; with a brass compression insh to prevent the marring of your telescope accessories Extension tube provides extra focuser "back travel" often needed for short-range terrestrial viewing through a telescope; or for astrophotographic applications Extend focal length of telescope 50mm or a little more; various models have focal lengths of 35mm 50mm and 80mm in our store; required spacing can be achieved by combining several extenders of differing lengths; use 1 2 or 3 pieces as you like Machined of high quality aluminum and anodized black; durable for long time use