Took the UV filter off the E90 just to check the thread arrangement and it doesn’t want to go back on properly. I tightened it up but if you put a bit of sideways pressure on the edge you can feel the threads slipping and then it is loose again. It will just work loose during a flight.
The adaptor ring seems to tighten up nicely - the threads on the filter must be pretty weak.
The adaptor ring seems to tighten up nicely - the threads on the filter must be pretty weak.