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My QHY guider has lots of noise but it doesn't much matter for guideing.
I have swapped it for an STi but this is because of sensitivity for spectroscopy work rather than the guider not working well.
I have only used 2 different scopes for guiding and did find the longer focal length one was better. I used a 600mm and a 950mm whilst imaging at 1800mm. The 950mm seemed better but this might also be because it is bigger in diameter so collected more light and hence had brighter star images for the same exposure.
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