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Yes, all my photos had very noticeable coma in the corners at 105mm and 100mm spacing it was at 90mm that coma started to be reduced and much better again at 85mm.
With the Meade f6.3 reducer image scale and coma from a non-flat field seem to be related.
The Meade reducer is a f6.3 reducer/flattener, it is the flattening of the image at 90mm to 85mm that results in less coma.
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