Binning just isn't very effective on the KAF-8300 full stop, but especially not on the colour version I suspect. It'll still work if you have have a faint overall field but you'd be better off just imaging a little longer from what I understand of these chips. For focusing it shouldn't matter much - just reduce the exposure time till you no longer get the smears.
Kodak would have made one the best CCDs just about perfect if they had dedicated accumulation registers rather than regular pixels for horizontal shifting.
Cheers,
Cam
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