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I've done it a few times Peter with imaging though both ED80 and WO72 SBS (5 min exposures) and autoguided piggyback. Not sure how it would go with a longer focal length scope or exposures though. The only thing I found was using the 20D it had such a heavy mirror slap that occasionally I'd see it in the exposure of the other camera. Using CCDs though that shouldn't be a prob.
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