Common imaging train

Askar FRA500 + ASI6200MM Pro + EFW 7×2" + OAG-L

The FRA500 is a built-in-flattener Petzval with a 55 mm image circle; its published figure is the maximum connection length behind the M48 thread, with the focuser absorbing anything shorter. Full-frame mono: ZWO only recommends 2" wheels for the 43 mm diagonal, the camera wears its M54 tilt plate, and the wheel and OAG-L bolt on with screws rather than threads. Every bore in this train has to clear the diagonal. Fits inside the maximum with focuser travel to spare; the 2" filter cell is the narrowest point to watch.