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SimCam is an online camera simulator designed to teach basic photographic principles. Whether you are interested in film or digital photography, the concepts are the same.
Shutter and Aperture Basic f-stop and shutter - Adjust the camera settings and examine the results to understand the relationship between shutter and aperture.
Film SpeedLearn about film speed - Shoot the same scene with two differant film speeds and compare exposures side by side.
Camera ShakeLearn how to spot and avoid camera-shake - Compare wide-angle and zoom examples side by side.