The Celestron OAG is great. I use one with my ASI294MC camera. The adapters that come with it allow you attach almost anything. The dovetail adapter design allows it to be rotated as needed if you want.
You should be aware though, that it is large. That is, it takes up a lot of back-focus room. For a color camera, this is not much an issue. If you use it with your ASI1600MM camera and filter wheel, you may run into an issue if you also use a focal reducer on your scope. You need to carefully add up the length of the adapters you will need and make sure they all total less than the back-focus requirement of your focal reducer.
Here are the optical path lengths for the OAG body and the adapters it comes with. You will need one of the adapters between the scope and the OAG body, another between the OAG and the filter wheel. Then you have to add in the path through the filter wheel, any adapters or extension couplings between the filter wheel and the camera plus the depth from the camera's threads to the sensor. If all that adds up to more than the recommended back-focus distance for the focal reducer, then you will have problems.
Adapter optical path lengths:
OAG Body: 29mm
Male M42 and M48 camera adapters: 12.5mm
Female M42 and M48 telescope adapters: 4.5mm
Short T-thread Spacer Ring: 6mm
Medium T-thread Spacer Ring: 11.55mm
Long T-thread Spacer Ring: 24.25mm
Medium M48 Spacer Ring: 11.55mm
ZWO Filter Wheel: 20mm
ZWO ASI1600MM Camera: 17.5mm
If you do not use a focal reducer, you are probably good to go. If you use a focal reducer or field flattener, add up all adapter lengths to make sure everything will fit. At the least, you will probably need the OAG Body and two adapters. That will be about 29 + 12.5 + 12.5 = 54mm in addition to your FW and camera. That may put you at roughly 91mm plus any other assorted adapters that could be needed because of not matching the correct thread pitch and gender.
It can be done for monochrome cameras but is much more difficult than with color cameras that don't need the filter wheel.
Edited by jdupton, 27 September 2020 - 10:37 PM.