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I have to back Gary up on his recommendation of the QHY5. If you do go down the QHY5 path may I suggest you get the mono and not the colour. I followed Theo's advice and got the mono and I never have troubles picking up a guide star with my ED80 using PHD. Similar to Gary I use between 2 and 3 seconds as my exposure time on the guider.
All the best.
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