365Astronomy 9-position 1.25" Filter Wheel
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This is a 1.25" manual filter wheel that can hold 9 standard 1.25" filters.
Can be used for photography or visual observations as well. (Needs additional optional eyepiece holder for the latter...)
There are female T-threads on both sides.
It also comes with a 1.25" nosepiece to attach it to any compatible telescope if otherwise the telescope doesn't feature a male T-thread.
On the camera side you may either use the femaly T-thread or the supplied reverse T-thread adapter that provides a useful male T-thread with a locking ring.
If you want to use it visually with an eyepiece, you'd also need to buy an optional eyepiece holder.
Optical length of the filter wheel
22.7mm thickness of the filter wheel itself without any additional adpters, although it is an unlikely way of using it...
Most likely it will be used with the reverse T-adapter, so that there is a female T-thread on one side and a male T-thread on the other side. In this case the optical length is between 27.7mm (when the locking ring is fully in) and about 29.0mm (when the locking ring is out, leaving 3mm thread for connection)
Overall diameter of the filter wheel:
Installation of the filters.
Back of the filter wheel is being held in place by 4 hex headed bolts. Allen screw is included to remove the back of the filter wheel and to access the interior for easier installation of filters.
Otherwise we didn't try, but we guess that filters could be also installed from the telescope side once the nosepiece has been removed, though it might be a bit ricky.