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Hi,
Is there a sweet spot or optimum range for image scales in a guiding system that provide the best autoguiding?
eg. many use the finder guider where at a 200mm FL and a camera like the qhy5, the image scale is 5.4 odd arcsec/pixel.
would it be beneficial to use a longer FL guidescope with the same camera and if so are there any guidelines or numbers that help determine the optimum guidescope FL?
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