Provides extra focuser “back travel” often needed for short-range terrestrial viewing.
Fits 1.25″ eyepieces or focusers.
Used when star diagonal is removed to allow focus – eg: Orion StarShoot Autoguider in ST80 OTA without star diagonal in place. The 1.25″ extension tube moves the Autoguider back far enough to reach the focal plane.
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.
Adds 2″ of length extension. It has two locking thumbscrews and is threaded for filters.