I bought a UV filter from Best Buy the other day to use on one of my boxes. I got the hole sized, added silicone and was installing it when I noticed that the lens fit in the ring was loose. It could move in and out some. I hadn't notice that with the first lens I tried. I figured if it wasn't fitting tight that moisture surely could find it's way inside. So I feathered a small bead of silicone all the way around at the corner of the lens and ring from the outside to seal it up. When the silicone was dry, I scraped off any excess that might impede the camera view. Has anybody else had the same problem or do they all fit that way and I just didn't notice it until then?