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Talking to BinTel yesterdau on auto guiding they said:
"Auto guiding can be done with a seperate telescope piggybacked onto a larger one and a CCD that picks a pixels and keeps your star there, but more recently this can be done with newer CCDs that stack and autoguide (interleveling between the two 10 - 100 times a second).
So you tyoically do segments of 10 - 100 exposures of length 5-10 seconds during each exposure the CCD is flipping between recording all pixels and then next round monitoring a target one to keep a guide star in view"
Gives you more options!
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