Hey Stephen, I don't have a ruler with me, but I reckon it's about 50mm or thereabouts from the top element of the 5x powermate to the ccd.
The 5x powermate is working as approx 5.5x, my filter wheel is in between the camera and the powermate.
I've unscrewed the visual top off the powermate, screwed on the T adapter, and then screwed this into the filter wheel. The video camera screws into the filter wheel from the other side with it's own T adapter.
cheers, Bird
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