ISO & Shutter Speed.

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Presentation transcript:

ISO & Shutter Speed

Shutter Speed: Shutter speed is the duration of time the shutter remains open to allow light to reach a digital camera sensor. Shutter speed is measured in seconds, or fractions of seconds. Using very fast shutter speeds “freeze” fast-moving subjects Slow shutter speeds are used to intentionally capture the movement of a subject For most, hand holding a digital camera at shutter speeds below 1/60th of a second often require use of a camera support to prevent camera shake.

fast medium slow very slow

ISO: ISO is the number indicating a digital-camera-sensors sensitivity to light. The higher the sensitivity, the less light is needed to make an exposure. Shooting at a lower ISO number requires more light than shooting at a higher number. Lower numbers result in images with the least visible noise, which is desirable. The higher the number, the more noise.

ISO 50 100 200 400 800 1600 3200 6400 If less light

ISO 50 100 200 400 800 1600 3200 6400 If a lot of light

ISO 50 100 200 400 800 1600 3200 6400 If less light ISO 50 100 200 400 800 1600 3200 6400 If a lot of light

100 400 1600 Canon Eos 10D

ISO 50 100 200 400 800 1600 3200 6400 Shutter 1/1000 1/500 1/250 1/125 1/60 1/30 Aperture 32 22 11 8 5.6 4 2.8 2

ISO 50 100 200 400 800 1600 3200 6400 Shutter 1/1000 1/500 1/250 1/125 1/60 1/30 Aperture 32 22 11 8 5.6 4 2.8 2

ISO 50 100 200 400 800 1600 3200 6400 Shutter 1/1000 1/500 1/250 1/125 1/60 1/30 Aperture 32 22 11 8 5.6 4 2.8 2

Exercise

Exercise: Camera Notebook Tripod Subject ISO exercise 1: you will be required to shoot a subject using the lowest ISO setting to the highest. Determine the right exposure (shutter speed & aperture @ ISO 100) and then increase the ISO setting to 200, 400, and so on. ISO exercise 2: Determine your exposure (shutter speed & aperture @ ISO 100) but this time adjust the Shutter & Aperture to maintain the correct exposure as you increase the speed of the ISO. Demonstration.

Exercise: Camera Notebook Tripod Subject Shutter exercise1: Keep the fan speed at 1 and capture images using shutter settings from 1/4th of a second till 1/1000th of a second. Repeat this exercise after changing the fan speed from 1 to 2 and the from 2 to 3 and so on. Demonstration.