I've just been experimenting on this dull Wednesday morning and have found that if I set ISO1600 and +2 stops overexposure, and then download the image and reduce the exposure in DPP by -2 stops to bring the exposure back to the correct brightness - then the noise in the final image is massively reduced compared with a normally exposed ISO1600 image - in fact the noise is so low that its virtually indistinguishable from a correctly exposed ISO400 image (not quite as good as ISO100-200 though but you need 100% magnification to tell).
I believe this is because the sensor is overloaded with light and that improves the signal to noise ratio - I've read this before on this forum but never tried it out as a technique.
EOS50D 24-105f4L used for the experiment.
I believe this is because the sensor is overloaded with light and that improves the signal to noise ratio - I've read this before on this forum but never tried it out as a technique.
EOS50D 24-105f4L used for the experiment.
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