This anodized, machined aluminum 1.25″ Orion Eyepiece Extension Tube provides extra focuser “back travel” sometimes needed to achieve focus with certain eyepiece / 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. Offered in both 1.25″ and 2″ models (OR-05124), which fit 1.25″ eyepieces and 2″ eyepieces, respectively. Each adds 2″ of length extension. Each also has two locking thumbscrews and is threaded for filters.