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David
Had a go with it as I wanted to check collimation (not the guiding function). It appeared to work well showing the airy rings with my video camera, but the atmosphere was really boiling and the red spot that shows collimation was hopping around. When the atmosphere settled the red spot settled in the centre of the stacked star. I had figured my collimation was pretty good but its focus dependant. The Bahtinov mask sure helped here and gave a definite focus point.
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