I don't think dark or flat helpson noise. Darks helps on hot pixels or other permanent sensor faults, but do not help on random noise. Flat helps on uneven field, which may help when you try to supress the noise floor, but not on the noise itself. These ones are made without dark or flat. The old one was ISO6400, the new one is gain 200. I think 200 is the max usable gain with this camera, as you can see the raw images are quite noisy. The only thing helps on noise is having many many pictures. 100 at minimum, but more is better. I usually make 200, but not all usable.