Canon Lens Cap E-52 II

Snaps on with a satisfying click and stays put, even after bouncing around in my bag for a week. The fit on my 52mm EF lens is snug without being tight, and I don't worry about dust sneaking past the edges anymore.

Finally, a lens cap that snaps on securely without that annoying loosening over time. The inner grip feels precise and it hasn't fallen off once in my bag.

I've had this cap on my 52mm lens for a few months now and it still snaps on firmly without loosening up. The spring mechanism is just tight enough to stay put in my bag but easy enough to remove with one hand.