QHYOAG is has the thin and solid design. The OAG main body is just 10mm thickness.(But you may need a M42 thread or M54 connector board with 3mm thickness, in this condition it is 13mm totally). There is six 3mm through hole in the OAG. It can connect with the QHYCFW2, QHY "A" series camera directly. If you have no QHYCFW2 and QHY "A" series camera, you can also use this OAG directly with some adapters.
QHYOAG has three models. QHYOAG-S,QHYOAG-M,QHYOAG-L, in order to match the different CCD sensor size.
QHYOAG comes with a multi-thread 1.25inch focuser. The focuser has a screw locker to get the guide camera solid fixed after focusing.
The prism position can be adjusted and it has a locker to fix the position. The prism is 8mm*8mm size and the optic hole from prism to mirror is 8mm diameter.