Common imaging train

Sky-Watcher Evostar 100ED + 0.85× reducer + ASI2600MM Pro + EFW 7×36 + OAG-L

The 0.85× reducer/corrector for the Evostar 100ED is a 55 mm M48 optic. 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. A slow f/7.7 cone: the 36 mm filter bore is nowhere near a problem here.