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Thanks for the comments and advice Gents.
This is what Terry Platt from Starlight Express advised as well:
"Many thanks for considering our Lodestar guider. It is extremely popular
and gives excellent guiding with PHD etc. You should get very good results when guiding with a 300mm FL guidescope, as the algorithms use sub-pixel accuracy. My only reservation is that our 'SuperStar' has smaller pixels and might be slightly more precise, although a little less sensitive."
The other alternative is the SBIG STi. I just wonder how it would compare. It uses a KAI 340 Kodak chip that is 7.4 microns square and 648 x 484 and appears to also allow darks to be subtracted etc.
...mmmmm...decision time.
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