Mine was very tight, out of the box. It has since loosened up. At first I thought a really problem with the new camera, as my XPro-2 and XT-2 never had the problem out of the box. I knew it wasn't the lenses, as my previously owned cameras did not exhibit the tight, tight mounting. But, it seems to have worked out and I haven't been changing a lot of lenses on the XPro-3