Canon RF 16mm F2.8 STM Instructions
Official user guide for the Canon RF 16mm F2.8 STM ultra-wide lens, covering setup, operation, safety precautions, and technical specifications for EOS R series cameras.
Table of contents
Product Overview
The Canon RF 16mm F2.8 STM is an ultra-wide lens designed specifically for Canon EOS R series cameras. It features a compact design with a Stepping Motor (STM) for smooth and quiet autofocus performance.

Safety Precautions
To ensure safe operation and prevent injury or damage, please observe the following:
- Do not look directly at the sun or strong light sources through the lens, as this may cause permanent vision damage.
- Always attach the lens cap when the lens is not in use to prevent sunlight from concentrating through the glass, which could cause a fire.
- Avoid exposing the product to extreme temperatures, which may cause malfunctions or physical damage.
Lens Operation
Attaching and Detaching: Ensure the camera is powered off before mounting or removing the lens. Align the lens mount index with the camera's index and rotate clockwise until it clicks. To detach, press the camera's lens release button and rotate the lens counterclockwise.

Focusing and Control Ring: The lens features a versatile ring that can function as either a focus ring or a control ring. Use the selector switch on the side of the lens to toggle between modes. In focus mode, you can set the camera to AF or MF. In control mode, the ring can be assigned to various camera settings like aperture or shutter speed via the camera menu.
Handling and Maintenance
To prevent condensation when moving the lens between cold and warm environments, place it in an airtight plastic bag and allow it to reach ambient temperature gradually. Keep the lens contacts clean and free of fingerprints to ensure reliable communication with the camera body. If the contacts become soiled, wipe them gently with a soft, dry cloth.
Technical Specifications
- Focal Length: 16mm
- Maximum Aperture: f/2.8
- Lens Construction: 7 groups, 9 elements
- Minimum Focusing Distance: 0.13 m (0.43 ft.)
- Filter Diameter: 43 mm
- Weight: Approx. 165 g (5.8 oz.)
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CanonManual page author
Emily Carter
User documentation editor
Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.