UPDATE: 12th October 2012
My previous report was based on the Canon 7D with Firmware Version 1-2-3. I recently updated this to Firmware Version 2-0-3 and have now discovered that the auto focus is very unreliable. I was shooting (metaphorically) some Crested Pigeons in our back garden and the AF was intermittent with the Canon 400mm F5.6L and Kenko Pro 300 DGX 1.4.
In Live View it seemed slightly more reliable but then when I switched to Movie Mode, I received an error message informing me that a lens was not attached?
Either something has changed in the Firmware Update, or I have accidentally and unknowingly changed a camera setting? I’ll begin the investigation and trials…..
Cheers
Dennis