This was the EOS-ID Mark III and the problem was inconsistent Auto Focus in continuous shooting mode, especially at high temperatures. A mirror that will not adjust properly is the cause of the problem. Luckily, good old Canon got onto it quick smart and now offer free repair for anyone whose camera has this problem. Watch the Canon website for details or email their technical support team using the buttons on the website.
A camera with auto-focus is a marvel of technology, with the camera lens elements having to move with extreme precision as well as speed and silence. To achieve this, Canon developed a first. It is a lens-based ultrasonic motor (USM) and uses ultrasonic oscillation energy that makes the torque constant and the start/stop instantaneous. This provides the photographer with almost unlimited shooting possibilities.
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