04-27-2018, 09:36 AM
Because you capture 4x the light, that is why.
Or (iow): DR gets determined by establishing a noise floor, and then seeing when that noise floor gets reached. By taking 4 samples and averaging them, you also average the noise per pixel, and the result is a higher DR.
Or (iow): DR gets determined by establishing a noise floor, and then seeing when that noise floor gets reached. By taking 4 samples and averaging them, you also average the noise per pixel, and the result is a higher DR.