Common imaging train

Askar SQA85 + ASI2600MM Pro + EFW 7×36 + OAG-L

The SQA85 is an f/4.8 Petzval with a wide tolerance on its M48 rear adapter — Askar quotes a range rather than a single figure, so a few tenths either way are not the problem they are on a fast flattener. The mono train ZWO designed the pieces around: the camera keeps its tilt plate, the 7×36 wheel bolts to it, and the OAG-L bolts to the wheel with its M48 plate facing the telescope. The unmounted 36 mm filter glass still shifts focus slightly, and the 36 mm bore is the thing to watch on anything larger than APS-C. ZWO's three bolt-together pieces land on 55 mm by design; the filter shift is the only correction.