T Ring rotation ...

[knobby]

I've googled this with not much luck , how much does your DSLR move when attached to the T ring ... Mine seems fairly loose ?

[Psychobilly]

It's normally due to slop between  the lens locking pin and the slot in the T mount... 

Saying that it's  even there with some of my expensive white lenses...

I used to use micopore tape acoss the join to stop the movement... or pack the slot with blutack or silver foil...

[Davey-T]

Make sure the incy wincy screws in the edge of the T ring are tight.

Dave

[knobby]

Cheers chaps, always wondered but never asked , usually wrap strap round focuser [emoji3]