Common imaging train

Player One Poseidon-C Pro + Filter Drawer MAX

The SQA55 is a 55 mm f/4.8 Petzval with a 44 mm image circle; Askar quotes a connection range with 55 mm recommended, measured behind its M48×0.75 rear adapter. Player One's Filter Drawer MAX sits on the Poseidon's M48 tilt plate — a wider bore than ZWO's M42 drawer for the same APS-C sensor. Player One does not publish the drawer's thread spec, so that joint is flagged rather than checked. The M48 tilt plate keeps the bore wider than the ZWO equivalent; the remaining gap is a stock extender.