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Hi All
Just as a postscript to this thread, I tried my QGuider for guiding with reduced focal length on my 150mm Mak, PHD gain set to max, focused carefully and employed a dark frame. With one second images I could now see about 5 guideable stars in my fov whereas before none were showing.
I was pleasantly surprised to see how the dark frame subtraction turned the QGuider screen from grey to black and made the stars more visible.
Thanks to you all for your advice - now to the next problem as there is bound to be one!
Cheers Peter
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