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As Paul said, nice tight round stars. Very monochromatic though, tell us a little bit more about how you took the photo, stacked it, processed it etc and lets see if we can guide you towards a more colourful experience.
ie Was it tracking with a mount? Did you save as Canon Raw or JPEG? What software did you use to stack? What format did you save from stacking program? Did you process the output in anyway?
With stars that round you should be able to extend way beyond 20sec exposures.
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