Alstar 2" 80MM Telescope Extension Tube Adapter - Bundle with - Telescope LRGB 2 Inch Filter Set

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
• 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
• The Alstar LRGB Filter Set comprises four filters: 2 inch luminance Filter; 2 inch Red Filter; 2 inch Green Filter; and 2 inch Blue Filter; this LRGB filter set enables you to combine high-resolution color images with a monochrome CCD camera
• The luminance filter transmits the entire visible light spectrum while blocking near some invisible light; these three RGB filters signify the three primary colors of red, green and blue; which are able to create a color photo