Canon Dots
The colored dots on your Canon lenses correspond to different types of lens mounts and alignment markers: 1. **Red Dot**: This indicates that the lens is compatible with Canon's EF (Electro-Focus) mount. These lenses can be used on both full-frame and APS-C sensor cameras. The red dot is used for aligning the lens with the camera body when attaching it. 2. **White Dot**: This is found on lenses with the EF-S (Electro-Focus Short Back Focus) mount, which are specifically designed for Canon's APS-C sensor cameras. The white dot is also used to align the lens with the camera body. The distinction helps ensure that you’re using the correct lens type for your camera.