Fotodiox Designer リアレンズキャップ 全Canon EOSレンズ対応（EF・EF-sレンズ両対応）

Finally, a rear lens cap that clicks on securely without that annoying wobble. The high-tolerance fit makes swapping lenses in the field feel much more reliable.

The high-tolerance construction really shows—this cap clicks on with a satisfying snap and zero wobble, unlike some loose ones I've had. My EF and EF-S lenses both fit it perfectly, so it's become the one cap I keep on my desk.

The fit is noticeably tighter than the stock caps I’ve used, so it clicks on with a reassuring snap and stays put in my bag. High-tolerance construction really shows here.