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Best current autoguiders as far as I can tell are ST402ME (super sensitive, cooled but a tad heavy and larger than the others, also expensive)
then Lodestar (which can have quality issues)
SBIG STi - has a shutter so you can do autodarks which in an uncooled camera is a definite advantage so the software doesn't confuse a hot pixel or an artifact for a guide star.
Greg.
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