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Anonymous
f-stop, also called aperture: basically tells you how big the hole in the lens that lets light in is. Lower numbers mean bigger hole, f/2.8 is larger than f/3.5. Larger aperture means more light hits the film or sensor, meaning you can use a faster shutter speed. Larger aperture also means shallower depth of field, which is how much of the image plane is in focus. Wanna blur the background? Open up the aperture.
shutter speed is easy, it's how long the shutter stays open. Faster shutter speeds let less light in, so you need a wider aperture and/or a faster ISO speed. Use a faster shutter speed to freeze action, a slower shutter speed to blur action. Slower shutter speeds allow you to let in more light but are prone to blur if you're not steady, or if your subject is moving.
Film speed or ISO speed is a number that determines the sensitivity of the film or sensor. Higher numbers mean less light is required for proper exposure. Need a deeper depth of field? Ramp up the ISO and use a smaller aperture. Pictures too dark? Ramp up the ISO. Pictures too blurry? Turn up the ISO and crank the shutter speed.
ISO speed, shutter speed, and aperture are measured in "stops", which means if you increase the ISO by a one-third stop, you can decrease the shutter speed or close the aperture by one-third stop to maintain the same exposure.
Someone else can clarify or tell me a faggot if this doesn't help.
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