perfect use, no vignetting on my 17-55mm. Perfect rendering. You can put the lens cover on it. Only downside: when I ride on my gun protection filter, and as I adjusted by turning in the direction of screwing, it gets stuck on the filter. Impossible to remove as it is fine and we have no control. I got stuck a week in Iceland with (so I was forced to remove the protective filter). I ended up asking a photographer to dissociate myself every 2 with a rubber strap. I have found a technique to the problem does not happen again.