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Mike, if you correct for the brightness differences in each image it seems like the DR2 may have less noise than the DX, even though the image will be dimmer.
So the possibility remains that if you boosted the brightness of the DR2 images (in software) to equal the DX then you'd end up with an image with less noise.
Noise is the real limiting factor in these cameras - 16 bit cameras make life a lot better since you still get a reasonably accurate image with very short exposures, but even so it takes a lot of frames to suppress the noise.
cheers, Bird
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