I made the low profile adapter for 85 mm backfocus with FF-FR and Canon camera..
Tube is 3D printed some time ago "just in case" (dimensions were taken from standard Celestron eyepiece adapter), M42x1 thread was glued in place (originally came from ebay (
M39 -> M42 ring adapter)), and M42-EOS adapter I had already. This should be good for test, the "
real thing" (it will require some machining to adjust the length) is on its way.
Weather looks good for Sat evening..