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I used to love the ECF on my EOS 5 and then EOS 3. I know it wasnt everyone's cup of tea but I loved it. No need to focus and recompose.

I currently have the centre AF point highlighted and recompose, I just had too erratic results with the camera choosing the focus point.

I want it back! Is there a technical reason with digital, or am I the only one who wants it?

From previous posts and other forums it seemed to be something that worked really well for a minority of users, and erratically or not at all for the rest. For people with glasses it almost never worked, and overall it just seemed to be a diversion from making the camera go.

Personally, I think the idea is excellent and if it worked I'd be keen to try it. But I've played with it briefly and it only worked at all if I blinded myslef by taking my glasses off, which meant it was unusable outside a studio (where it's superfluous).

I expect Canon have given it up as way too hard, even if the technology has improved it'd still take effort, space and battery life to make it go, and I doubt there's enough demand to make it a key feature.