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Anonymous
>>39915 Shutter speed is how long the camera is taking the picture for. In most cases, you will want this as low as possible where your exposure is fine, because too long will blur the photograph because of your hands shaking, things moving, etcetera. Sometimes, like a car driving past on the street, you'll want this long to give the idea of "motion."
Aperture is how open the lens is, measure in f-numbers, which are like golf scores: the lower the f-number, the more open the lens is. Lower f-numbers mean there is less depth of field, which just means a smaller fraction of what the camera sees is in focus. Higher f-numbers mean there is more depth of field, which means the opposite. Typically, one would use high depth of field to shoot something like a landscape, where detail needs to be captured across the field of view. Low depth of field is for things like portrait photography, where there is one subject and everything else is just distracting.
ISO Speed is how sensitive the film/camera sensor is to light. Unless you're intentionally messing with the photograph for artistic reasons, always shoot at the lowest ISO that will still let you set the aperture and shutter speed as you want them. Higher ISOs have more grain, that is, little speck-spots on the photograph. In film cameras, that comes from there being more silver in the film; in digital, I think it is a limitation of the sensor, but I'm not sure.
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