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well, that makes it easier. I'd suggest getting that cable or if you join the yahoo group, you can get the 6pin din connector pinout and make your own.
Also have a look through this forum for other Em200 owners who've added autoguiding. I'm sure there are others who've done it already.
Which guide camera do you have and which guide scope do you have?
the easiest is the finder guider but do check to make sure the pixel scale is suitable.
Else, you could use a webcam (not all brands, some are more sensitive than others), and then use the GPUSB interface from shoestring astronomy. that provides ST4 output using webcams as guidecameras normally have ST4 ports built in.
have you tried the CCD polar alignment method yet? do try it, very easy and very accurate.
Cheers.
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