A nifty accessory that allows you to accompany you on your astrophotography journey. The sliding cell can be fixed at any point along its length, giving you a variable projection distances during eyepiece projection photography, making it unnecessary to swap between eyepieces for additional magnification. Prime focus photography is also possible with the separable thread-in unit.
Will fit all 1.25" sockets. 35mm cameras require the use of a T-ring.