Sorry to raise this topic again, with so many variables in the equation (OS platform - in this case Mac 10.2.5 - hence determining for the moment RAW conversion options, etc), and I ask your forebearance. When printing to A4 (= 8.26 x 11.7 inches), and under natural, low-light conditions, hand-held, how high does your experience indicate one can go in regard to ISO settings to get a very pleasing print at this size? (I know, it's also in the eye of the beholder). It would seem that some who had proclaimed noise-free images up to ISO 400, which prompted concerns about sensor quality variability, have apparently indirectly retracted. Subjects are landscapes and people. Thanks in advance for your feedback.