Canon EF 70-300mm f/4-5.6 IS II USM User Manual - Page 9

1. Mounting and Detaching the Lens See your camera's instructions for details on mounting and detaching the lens. 2. Zooming ●●After detaching the lens, place the lens with the rear end up to prevent the lens surface and contacts from getting scratched. ●● If the contacts get soiled, scratched, or have fingerprints on them, corrosion or faulty connections can result. The camera and lens may not operate properly. ●● If the contacts get soiled or have fingerprints on them, clean them with a soft cloth. ●● Attach the lens cap and dust cap when disconnecting the lens. When attaching the dust cap, align the lens mount index with the  index of the dust cap and rotate in a clockwise direction as shown in the illustration. Follow the reverse procedure to detach it. To zoom, turn the lens' zoom ring. ●● Be sure to finish zooming before focusing. Zooming after focusing can affect the focus. ●● Blurring may temporarily occur if the zoom ring is quickly rotated. ●● Zooming when the camera is OFF will result in delayed focus. ●● Zooming during still image exposure will result in delayed focus. This causes any streaks of light that are captured during exposure to be blurred. ENG-8