The newly redesigned ZWO M54 filter drawer allows you to manually add a 2" mounted filter to your optical train. This updated design is better sealed than the previous version, so light leaks are no longer a problem with extremely long exposures.
Note: The previous version of the filter holder is not compatible with this V2 filter drawer. Likewise, the V2 filter holder is not backwards compatible with the previous filter drawers.
The included filter holder has a M48 x 0.75 thread for standard 2" filters. Two magnets secure the draw and a grab screw adjusts its tension. The drawer includes a M48 female - M54 male adapter to adapt the drawer to accessories with M48 x 0.75 thread. It has an optical thickness of 21mm.
Note: The previous filter holder design is not compatible with the new drawer.