Starlight Xpress Slimline Off Axis Guider with Extension Tube

Starlight Xpress Slimline OAG package comes with a 30mm long extension-tube, which is used between the OAG pick-off prism and an auto-guider. It allows for parallel focus to be achieved in situations where there is a longer than "normal" path-length between the OAG and primary camera, such as when extra accessories are used with an SX camera, like an AO system, etc., or when non-SX cameras with deeper focal-planes and being used.