Pentax Optio 550 may be old, but it is still a good buy. The programmed auto-exposure mode provided by most digital cameras will only take you so far. It’ll provide perfectly acceptable snapshots, but it doesn’t provide the kind of creative control that more ambitious photographers will need. Why? Because programmed auto-exposure systems adjust the shutter speed and aperture in combination to get the right exposure. That’s fine if you don’t really understand much about photography but you miss out on the creative control possible when you can adjust the aperture and shutter speed independently.

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