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I don't know that chip orientation longer side or shorter side is important, rather that they are square. Check the manual on that point though. You also need to have your polar alignment pretty good first as well. Otherwise you won't be able to keep the guide star in the frame of the chip for the time required to record a decent number of worm cycles. I used 20 minutes and it has to be pretty accurate to keep it in the guide frame for 20 minutes at least using CCDsoft it is.
What is also vital is east/west otherwise your curve will be upside down and it will be pushing when it should be pulling so to speak.
Greg.
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