Mike Martin wrote in post #19139768
...I've found that the
EF-R adapter can
easily become unlocked if the camera is on my hip...
Just to confirm, the adapter came off the body and not the lens came off the adapter, correct? So, you are saying that using the strap, all the movement and twisting, via the strap, can make the adapter come loose easily?
I've also use the BR straps since they came out (still using the original version) and always connect it to the lens foot because it hangs parallel to the ground vs the camera body which makes it sit awkward for me and it never binds causing undue pressure on any part of the camera; it twists freely, so not to cause it to loosen itself from the foot. , I mostly have my hand on the foot to keep if from banging against my leg, but it swings freely when I am carrying the 600 on the tripod and the 100-400 on the side. I always double check to make sure the lens or in this case the adapter has clipped in and I give it a couple twists. I use the BR strap in this manner with the 600 f4, 300 2.8, 100-400...with and without TCs; any lens with a foot.
It sounds like with the camera and lens banging against your body, it caused the the adapter to come loose. Perhaps the R5 connection point s not as robust as the old Dslrs in that regard. I will keep an eye out for that.