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It would only be to save space on a card.. I guess if you had a slow writing card, using a small size file would allow maximum FPS.
For A4 you will get away with 7.1 mp. However, if you one day take the stunning photo of your life that will be worth millions, you really need it at as high a MP as possible, getti images for example demand a high MP level..
Taking at a higher MP, as well as bigger prints gives you the chance to crop your image keeping some level of sharpness..
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