Canon EF 600mm f/4L IS III USM EF600mm f/4L IS III USM Instruction Manual - Page 7
Attaching and Detaching the Lens
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1. Attaching and Detaching the Lens Lens mount index Lens release button Attaching the Lens Align the lens mount indexes of the lens and camera, and turn the lens clockwise until you hear a click. Detaching the Lens Turn the lens counterclockwise while pressing the camera's lens release button. Detach the lens once it has stopped turning. Please refer to the camera's instructions for details. OO Set the camera's power switch to OFF when attaching or detaching the lens. OO After detaching the lens, place the lens with the rear end up and attach the dust cap to prevent the lens surface and contacts from getting scratched. Make sure the lens and dust cap mount indexes are aligned when attaching the dust cap. OO Contacts that are scratched, soiled, or have fingerprints on them may result in faulty connections or corrosion, which may lead to malfunctions. If the contacts get soiled, clean them with a soft cloth. OO The lens mount has a rubber ring to improve dust-resistance and water-resistance performance. This rubber ring may cause friction marks to appear around the camera's lens mount, although this will have no effect on usage. OO Since the lens is heavier than the camera, turn the camera when attaching or detaching the lens. Ensuring that the lens can rest safely on its own is recommended, such as first mounting it on a tripod. OO Rubber rings can be replaced at a Canon Service Center at cost. ENG-6