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When we talk about refractors and coma it brings up the concept of corrected image circle. That is the diameter in mm of the circle of the image from the refractor that is aberration free.
This varies with different models and is a stat that is worth knowing about your scope. It becomes a problem if you want to use a camera with a sensor with a diagonal size greater than that corrected image circle size.
As pointed out flatteners can correct this but they also have their corrected circle. Again if that is too small for a large sensor you will still get coma in the corners.
Greg.
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