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Hi Martin, I don’t have that particular scope but a 6” f/5. The question of coma is not whether it has it. It will. Coma is not a quality issue like astigmatism but a natural function of a curved mirror. The degree of coma (that is how much flat field without coma one gets) is determined by the f ratio. The faster the scope, the smaller the area that is free of coma. At f/5 you are not bothered much by coma visually when using ie Plössl eyepieces with their 52 deg AFOV. However, a DSLR image will show coma pretty much from the center of the image, so one can’t even crop it out. You would need a coma corrector or get used to images that look like taken at warp speed.
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