The ZWO filter drawer features an M42 * 0.75 male thread (camera side) and an M48 * 0.75 female thread (telescope side)
Filter slide: M48 * 0.75 female thread
The drawer is a total of 21 mm in thickness.
The strong magnet holding the slide creates a good seal and avoids accidental filter drops.
This kit contains one drawer and one filter slide. Additional slides are available.
Note that Optolong filters with threads on both sides will not fit into this drawer. If you have the standard Optolong filters with threads on one side only, this drawer will work well.
There is a lock screw on the side of it. The locking function is helpful in adjusting the tension to eliminate any gaps.
The filter drawer also comes with the M48-M42 adapter. You can use it with your camera or your telescope.
66mm (height) * 66mm (length) * 21mm (thickness)
M42 * 0.75 male(external) thread (camera side)
M48 * 0.75 female(internal) thread (filter end)
M48 * 0.75 female(internal) thread (telescope side)