Followed the directions for mounting it several times and nomatter what there appears to be a large amount of slop between the actual lens and the surround framing hood. It has about a 32nd of an inch of slop in one plane even after being framed and tightened down. Is this normal and a acceptable range? The threading to the camera is perfect the slop isnt there. It is in the actual lens asym. I am having some focus problems even still and wondering if this could be the cause. Any ideas would be appreciated. TIA