Russell I think this slim filter drawer might just work with 36mm filters:
https://www.teleskop-express.de/shop...w-Profile.html
I would be concerned about my heavier than normal cooled camera hanging off the back of it though. Teleskop-Express makes pretty good gear but it would be a risk without trying one out. I need a solution that works for both the RC and the Newt (with the Baader MPCC on the camera). With the RC I could get a special M90 adaptor ring made by Precision Parts so that I could move the camera a little closer to get more room for the filter drawer if needed. The Newt setup would need to be tested, I think I just have enough room for the drawer, but if I don't it would require moving the primary a little.
The Clip-in Narrow band filters are fairly attractive from a cost point of view (from some sources); and do not require buying more gear, or mods that might introduce flex in the imaging train.
Does anyone have any experience with the Teleskop-Express DSLR filter drawer?