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Message: <blockquote data-quote="Roy C" data-source="post: 1368688" data-attributes="member: 18798">I cannot seeing happening either Kevin.Re 40D/50D centre focus point, it is nothing to do with having being programmed not to accept taped converter but is to do with the centre point being enhanced for use with f2.8 lenses. As a matter of fact, I use the 40D with my 400mm f5.6 and a taped converter most of the time at the moment and it AF's OK given reasonable light and a fair contrast. Using a taped tc on the 40D is not quite as effective as the 30D but better than a 350D!. Apparently the 100-400 really struggles but that is obviously nothing to do with the camera being programmed.I do not know who told you this story about being programmed but you can tell them from me that it is rubbish as I have taken at least 1000 shot in the past couple of weeks with a taped tc (on AF mode).</blockquote>