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My Panasonic Lumix DMC-ZS15 P&S (about 2yrs. old, records in JPEG) takes fine pictures for my purposes (at most 5x7 prints). It has 12.1MP, 16x zoom, and a 1/2.3 MOS sensor. I always use the "high quality" setting and auto settings for aperture and shutter. I have always wondered which MP setting would give me the best resolution vs. noise in the final image. I asked a similar question 2days ago, but now I am looking for a more specific answer. I realize this new question may be more specific, elementary,and possibly neurotic than you guys care to deal with, so please feel free to ignore me if that is the case. I have experimented and learned that I probably do not need all 12MP but still cannot make up my mind between 5 & 8MP. Thank you for your consideration.