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Hi Matt,
I was just looking up vignetting and I quote from "The New CCD Astronomy" book "This refers to having a brighter centre area in the field of view, and can range from a very slight difference to an extreme difference".
The way I read it, the flat field would even this difference out and produce a more uniform image.
I,m sure other member with more experience could elaborate on this.
Cheers
Ric
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