midgley

<p>I've been given a film EOS body that also offers the eye control. I may never put film through it, but it does seem a clever system. Also found on Apache helicopters, I think.</p>

<p>I have two 7D bodies. One was bought a year or two before the other, in LA as it happens, not very long after it was released.<br> Fitting a Kenco C-AF 2x converter to them produces different behaviour: the older one will not autofocus with a 70-200/2.8 IS2 lens nor with a 100mm/2.8 IS except that when manually overriding focus there is an occasional flicker of movement, but off focus rather than onto focus. <br> The camera will then not switch off with the on/off switch, and requires the batter removing to reboot it.<br> In all other respects the body behaves properly - it has been round the world a few times but is in visibly good condition.</p> <p>The younger one accepts the converter, autofocuses and switches on and off.</p> <p>Initially I thought "Aha, firmware!" and upgraded the old one from 2.0 to 2.0.5 (and the younger one, while I was at it, from 2.0.3 with which it had been supplied (the older one was supplied with version 1.n ( n= .25 I think) firmware).<br> No change.<br> There is a battery handle - not Canon - on the older one, which I have not yet tried excluding or swapping over because it seems rather remote from the operations giving trouble. <br> The Canon 1.4 converter version 2 works on both, as does everything else in the cupboard. <br> I found nothing on the Web via Google, yet, relating to such behaviour.<br> Where would the panel look for an answer or solution? (I'd rather have the heavier better powered body on the back of the big lens but obviously I can use the lighter one, but I like things to work interchangeably)</p> <p> </p>