Canon Rear Lens Cap E

Of all the accessories in a photographer's bag, the rear lens cap is undeniably the most frequently lost, misplaced, or accidentally left behind at a shooting location. Yet, it serves one of the most critical roles in your entire kit: protecting the highly sensitive, exposed rear glass element and the delicate electronic communication contacts of your unmounted lenses.

The Canon Rear Lens Cap E (officially categorized by Canon as the "Lens Dust Cap E") is the genuine, Original Equipment Manufacturer (OEM) replacement for your classic Canon DSLR lenses. By keeping a few of these inexpensive, lightweight caps as spares in your camera bag, you ensure that your expensive L-series glass and everyday EF-S zooms remain completely protected from dust, smudging, and catastrophic scratches while in transit.

• Genuine OEM Fit: Because this is an authentic Canon accessory, it is molded to exact factory specifications. Unlike cheap, generic third-party caps that often fit loosely and accidentally pop off inside your bag, this cap twists and locks onto the bayonet mount with a reassuring, secure "click."

• Crucial Glass Protection: The rear element of a lens sits dangerously close to the mount opening. If it gets scratched, that scratch will severely impact your image quality. This sturdy, high-impact plastic cap acts as a physical shield against keys, zippers, and other gear shifting around in your backpack.

• Protects Electronic Contacts: The gold-plated pins on the back of your lens are responsible for sending autofocus and aperture commands from the camera. This cap seals out moisture, sand, and abrasive dust that could otherwise corrode or damage these vital communication contacts.

• Universal DSLR Compatibility: This single cap is the universal standard for Canon's entire DSLR ecosystem. It fits flawlessly onto any Canon EF lens (full-frame) or EF-S lens (crop-sensor), as well as Canon's EF Extenders (teleconverters) and Macro Extension Tubes.

The absolute most critical factor before purchasing this cap is verifying your lens mount system. This cap is designed exclusively for classic Canon DSLR lenses (the EF and EF-S mounts). It will not fit modern Canon mirrorless lenses. If you shoot with the modern EOS R system, you need the Canon Lens Dust Cap RF. If you shoot with the older EOS M mirrorless system, you need the Canon Lens Dust Cap EB.

Secondly, to properly attach this cap to your lens, you must align the index marks. Look for the small, embossed line or dot on the outer rim of the plastic cap. This mark must be aligned with the red dot (on EF lenses) or the white square (on EF-S lenses) on the lens mount before twisting it clockwise to lock it in place. If it is not aligned properly, it will not seat correctly and could jam.

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