Promaster Professional Lens Cap 40.5mm

Finally, a cap that doesn't annoy me every time I pull it out of my bag. The center lock is firm enough that it hasn't popped off once, and the precision molding makes it a perfect fit on my 40.5mm lens.

The center lock snapped into place perfectly on my first try—no more fumbling to get the cap on straight. It feels more solid and precise than the generic caps I've used before. Exactly what I needed for my 40.5mm lens.

I was a little skeptical about the center locking mechanism, but it clicks on securely and hasn't budged since I put it on. The fit is noticeably tighter than my old cap, which gives me peace of mind when I'm hiking with the camera.