Promaster Nikon F 後鏡頭蓋

Lost my old cap after a shoot and grabbed this one as a replacement—it clicks on with a firm, reassuring snap that feels just right. The fit is snug enough that I don't worry about dust sneaking in when I toss it in my bag. Solid little piece of plastic for what it does.

Finally, a rear cap that snaps on securely without that annoying wiggle. The plastic feels sturdy enough to protect the lens mount in my bag.

Honestly, I've bought cheap caps before that fit loose and let dust sneak in. This one seats flush against the mount with zero wobble, so the rear element stays properly sealed when the lens is sitting in my bag. Exactly what a cheap piece of plastic should do.