Originally posted by swanlefitte So the camera is fine and I won't take m42 lenses out with any rain at all anymore. The connection is way too open.
It depends upon the lens. Most should snug up tight to the camera's mount flange to provide a seal equivalent to what they would have on an M42 body. The hitch comes with certain FSU (former Soviet) lenses that have unusually narrow mount face* and other lenses that do not fully extend over the body's mount contacts allowing for water entry at those points.
Steve
* Those lenses will typically "rock" back and forth on the mount and generally require some sort of bolster or shim to avoid light leaks and assure consistent focus.