I bought the OAG some time ago, but I hadn't used it yet. Yesterday I tried it with a cooled ASI 1600MC and my venerable ASI 120mm.
I put the 21mm extender to the 1600, and the 5mm extender to the 120 but I realized that the 120 was not well focused. I estimate I would have needed about 5mm more distance (a 10mm extender)
https://www.shutterstock.com/image-illustration/flying-sparrow-bird-logo-modern-simple-1261956871?src=MgtpJHWbwOyikpJ8D4eUag-1-69