The ZWO 2-inch Filter Drawer with 21mm ring design is independently developed by ZWO, which includes M42 * 0.75 male thread (camera side) and M48 * 0.75 female thread (filter end), M48 * 0.75 female thread (telescope side).

Key features:

• Useful option for using single filters
• Includes filter holder and 1x filter holder
• The filter drawer also comes with the M48-M42 adapter. You can use it with your camera or your telescope.
• Side locking screw, helpful on adjusting the tension to eliminate the gap