Alstar 2-Inch 50mm Telescope Extension Tube - Bundle with - 2-Inch 35mm Telescope Extension Tube

Alstar 2-Inch Telescope Eyepiece Extension Tube Adapter provide extra focuser back travel sometimes needed to achieve focus with certain eyepiece or telescope combinations. More back travel is often needed for short-range terrestrial viewing or with use of a field flattener, coma corrector, or focal reducer lens. Extension tube provides extra focuser "back travel" often needed for short-range terrestrial viewing through a telescope, or for astrophotographic applications. Fits in 2" telescope focusers, and accepts 2" eyepieces or accessories. Features two locking thumbscrews to secure any inserted astronomy accessory, with a brass compression insh to prevent the marring of your telescope accessories. Machined of high quality aluminum and anodized black, durable for long time use.

• Extension tube provides extra focuser: back travel often needed for short range terrestrial viewing through a telescope; or for astrophotographic applications
• Fits in 2 inch telescope focusers and accepts 2 inch eyepieces or accessories; Threaded for use with standand 2 inch astrophotography filters
• With this simple and useful device; you can extend the focal length of your telescope 50mm or a little more; The required spacing can be achieved by combining several extenders of differing lengths as you like
• Features two locking thumbscrews to secure any inserted astronomy accessory; with a brass compression insh to prevent the marring of your telescope accessories
• Machined of high quality aluminum and anodized black; resistant for long time use