Notes: ISO, Shutter Speed & Aperture!

Exposure

-exposure controls how light and/or dark an image is
-it’s the mixture of all three pillars of photography: ISO, shutter speed and aperture

ISO
-iso is the level of sensitivity of camera to available light
-the lower the level, the less sensitive, the higher= more sensitive
-base iso is the lowest iso number of the sensor, that can produce the highest image quality, without adding noise to the image. Ranges:100-200 (base iso), 400, 800, 1600, 3200, 6400. Each step in between doubles sensitivity
-With increased sensitivity, there can be more graining

Shutter Speed

-shutter speed is the amount of time the shutter is open
-it’s measured in seconds and fractions of seconds
-slow shutter speeds require tripods and cause blurriness to moving objects
-want a fast shutter speed for taking pictures of sports or flying birds etc.
-want a slow shutter speed if you want to capture paint drying, or a snail moving, stuff like that

Aperture
-aperture is the hole in the lens that lets light into the camera body (the pupil of your eye is the aperture of photography)
-adds dimension by blurring background and bringing subject into focus or makes everything in focus
-diaphragm: stops or blocks light, with the exception of the light that goes through the aperture
-expressed in f-numbers, which are described as f-stops
-f-stops describe the size of the aperture; the bigger the number, the smaller the hole
-if you want the subject in better focus, use a larger f-number. The smaller the hole, the more in focus the subject and the blurrier the background

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