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Remember too that the raw Canon images are only 12 bit. When I convert them to 16bit fits files any variation in illumination differences is increased. Plus the accuracy of the light meter is an unknown with the responsiveness centered on the green. It would be interesting to split the colours and just check the green channel.
I did do a conversion (colour to fits without splitting the channels) and using the image of the whole box illumination and checking the mean value at various points there was a less than 6% variation in intensity from the edge to the center.
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