ProMaster Professional スナップオンレンズキャップ – 39mm

Finally a lens cap that doesn't pop off when I'm reaching into my bag. The center locking mechanism clicks on nice and tight, but it's still easy to remove one-handed.

Precision molded means it fits my 39mm lens thread like it was machined for it—no wobble, no wrestling. The center button releases with a firm click, and it's stayed put through a week of tossing it in my bag.

The center locking mechanism gives a satisfying click when it snaps into place, and it stays put even when I toss my camera bag around. No more fishing for a lost cap in the bottom of my backpack.