The ZWO 2" Drawer Filter Holder (Mark II) with M54 thread is typically recommended for cameras with larger (full-frame) sensor sizes. It allows you to quickly replace the 2" filter without removing the camera and without clogging up your setup, making it a lightweight, practical alternative to filter changers.
The filter drawer has M54 threads on both sides. An M54/M48 adapter is included in the package, which can be used to mount the filter drawer on the telescope side of the M48 threaded devices (e.g. coma corrector).
The lightweight yet sturdy construction features a magnetic lock for precise attachment of the filter drawer, with matte black surfaces that are non-reflective all around. Since the width of the ZWO 2" drawer filter holder is exactly 20 mm, it replaces the 20 mm T2 extension when used with ZWO cameras.
This product includes one 2" filter holder drawer, but additional drawers can be purchased. The Mark II differs from its predecessor in that the filter holder and its drawer are linked together to eliminate possible light interference. The two small "wings" of the drawer snap onto the cover of the branch holder.
