I can't comment on camera issues, but I can tell you that having an uncompressed version of an image is always good if you're planning to do any printing from it. Also, if you create an image for the web and later decide for some reason you want a larger version of that same image, you'll need to go back to the uncompressed version to make that larger image. You don't ever want to resize a jpg file up in size. The sacrifice in quality is too great.
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