If you require a 2" to 1.25" adaptor but can't afford the large profile of regular adaptors, then this is the one for you. Once fitted, this adaptor has an optical length of just 1mm, minimizing the optical train length.
Celestron 1mm C Mount Adapter for Straight Through Finders Connects QHY5-II Series, Lodestar, Orion SSAIO, Mintron, Watec & DMK cameras, via their C / CS mounts to Celestron Finders with 1mm rear finder thread.
The Sky-Watcher & Clones to C Mount Adapter for Straight Through Finders Connects QHY5-II, QHY5L-II, Lodestar, Orion SSAIO, Mintron, Watec & DMK cameras, via the C mount adapter to Sky-Watcher, Celestron and Orion 8 x 50 & 9 x 50 straight through finders.
The Sky-Watcher & Clones to T thread Adapter for Straight Through Finders Connects ZWO, QHY6 and Orion SSAG cameras with the T Thread to Sky-Watcher, Celestron and Orion 8 x 50 & 9 x 50 straight through finders.
This well made adaptor drops into any 2" opening, giving you 1.25" plus the added benefit of a strong twist lock clamp. Simply drop your eyepiece in, twist the blue part, and you have a solid connection.
This adaptor screws onto male T thread and provides you with a 1.25" opening with a secure twist lock mechanism. This holds far better than the standard thumb screws and compression ring that is found on cheaper adaptors.