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Daniel
I found that I had to very slowly find the focus for the guide camera - I tried using a very bright object like the moon first for example - that way you can easily see if you're moving the guiding CCD in the right direction; either inwards or outwards - what I finally found is that depending on the rotational position of the OAG port/prism (you can rotate it so that you can "pick" a star) that some of the guide stars are not shaped like what you're expecting - ie I've used stars that look like footy/rugby ball, sorta cigar-shaped and they do guide!
You can easily miss the focus point on either side of focus - in my case I had my FF->OAG->spacer/extension tube to suit->imaging CCD
HTH
Cheers
Bill
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