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Higher binning will work if your stars normally subtend several pixels, however the Kodak 8300 chip seems to not do well at binning according to discussion over at CN. The suspicion is that the horizontal register bins are only a little "deeper" than the regular pixels, meaning that extra charge from binning is lost.
I've never been able to confirm or deny this but it makes sense to me.
Hope this helps,
Cam
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