How does aperture affect my photographs?
Why should I care about the aperture with which a photo was taken?
Answer
The aperture is the opening through which light goes to reach the camera's sensor.
The size of the aperture affects not only the amount of time required to take a photo, but also the depth of field within it.
With a wide aperture (so a low number, like f/1.8) gives a shallow depth of field - sometimes less than a millimetre with a macro lens. Because a lot of light is reaching the sensor (be it film or digital), this allows for fast shutter speeds
With a narrow aperture (so a high number like f/22), the depth of field is much greater, which is useful for things like landscape photography - it will limit the amount of light reaching your sensor, so you will get slower shutter speeds, which makes a tripod handy.
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