These days, the easiest way to learn what your camera does is to take it out and use it. Instant feedback shows you how different apertures affect depth-of-field, how faster and slower shutter speeds can freeze and blur the action, and how zooming your lens can affect more than just how big things are in your photos.
But back in the days of film, where a week could go by between tripping the shutter and seeing the results, something like the Camera Sim would have been invaluable. Even today, this SLR simulator is a great learning tool. It's a Flash application that runs in your browser and lets you adjust everything that can affect the picture.
Drag to change the lighting from dull and overcast to bright sunshine, to change your distance from the subject, the aperture, shutter speed, ISO and the focal length of the lens. Choose aperture priority, shutter priority, or manual exposure modes, then press the shutter to take a picture.
Your snap is displayed complete with motion blur, exposure errors and even high-ISO sensor noise. A complete novice will still need some instruction, but once that's done they can twiddle around and see which control affects what.
It's a shame it uses Flash, as this is the perfect sim to have on the phone or tablet in your pocket. If there isn't already an app for this — which would allow a beginner to check up on things in the field — somebody should write one already. As it is, the Camera Sim is free, with v2.0 on the way.
Camera Sim [Camera Sim]
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