ZWO 2″ Filter Drawer with M54 male / M54 female Connections (one filter holder included)

The ZWO 2-inch Filter Drawer with 20mm ring thickness design has been independently developed by ZWO, specifically for their FULL FRAME cooled cameras, the ZWO ASI6200MM-PRO and ASI6200MC-PRO.

It includes an M54x0.75 male thread on the camera side and M54x0.75 female thread on the telescope side, and it is suitable for 2" filters (the filter container has got a M48 * 0.75 female thread).

It also comes with a M54 to M48 adapter, so that you can attach it to a telescope or flattener/redcuer that features a male M48 thread.

The main idea of a filter drawer is to use it with a colour camera where there is usually no need for lots of various filters, usually just few filters need to be swapped between sessions. One of these would normally be either a UV/IR-cut off or light pollution filter (CLS, UHC etc) and the other filter would be a narrowband, i.e. H-alpha or a Dual Band filter.

See images below:

The M48*0.75 female thread on the filter container allows the use of standard 2" filters.
The M54*0.75 female thread can be used to connect with the telescope and the M54*0.75 male thread can be used to connect with the ASI6200 camera.

The double strong magnets create stronger hold, easier installation and pulling out.

There is a lock screw on the side of it. The locking function is helpful on adjusting the tension to eliminate the gap, which is a double insurance for users.

With the ability of double strong magnetic pull, it is more convenient and much easier to install or pull out the filter.

There also is a M54-M48-2 adapter that is included with the M54 Filter Drawer, so that you can attach it to a telescope or flattener/reducer that features a male M48 thread.

Connection excample

Mechanical Drawing

70mm(height)*70mm(length)*20mm(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)
Suitable for 2-inch astronomical filters

The best solution to achieve a 55mm back focus distance

Note：with this solution you can only reach 56mm back focus length. Also the M48-M42 adapter will block the camera sensor a little bit.

If it has to be precisely 55mm back focus length then we recommend to use 2”EFW with M68 OAG：

Click here for more connection methods of ASI6200 to get 55mm back focus length:

https://astronomy-imaging-camera.com/tutorials/5-connection-methods-to-get-55mm-back-focus-length.html

What’s in the box?