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I have also found that NOTHING beats the in camera noise reduction in the Canon 5DH. I can assure you I have tried everything. ImagesPlus comes close but not as good. If the temperature changes over the image collection, the correction turns to crap. The drivel about taking twice as long is a lie as I have never had good noise reduction using a set of dark frames collected before or during or even after. The only consistent results was you guessed it ICNR. Canon do something very cunning the noise in their chips is subtracted at the sensor individual pixel level (ie every green green blue and red) we cannot beat this with software after interpolation.
I am working on putting my 5D into a peltier fridge maybe then if the temperature remains constant which I highly doubt.
Bert
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