photo the shutterchoosing the correct shutter speed… • determined by the light conditions •...
TRANSCRIPT
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The Shutter
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Shutter….
• Shutter – Curtain – Set of blades – Some cameras have a leaf shutter. Looks like
aperture. P. 67 – Blocks light from entering and striking the film
– Some shutters are mechanical – gears and springs. – Some shutters are electronic.
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Leaf Shutter
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To take a photo…
• Press the shutter button • The shutter then opens and closes • The amount of time the shutter stays open
is variable. • Interval of time is called the shutter speed. • Some cameras let you adjust the shutter
speed. (Manual) • Some cameras do it for you. (Automatic)
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Shutter affects….
1. Controls exposure (How long the light hits the film for)
2. Appearance of motion. (Whether an image looks sharp or blurred.)
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Controlling Exposure
• Exposure is controlled by two variables…
1. Amount of time the shutter stays open. 2. Size of the lens opening (F-stop)
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Choosing the correct shutter speed…
• Determined by the light conditions • You have to select a shutter speed that allows in the
correct amount of light.
• Shutter speeds… • 1,2,4,8,15,30,60,125,250,500,1000,2000,T,B
• Low light conditions=slow shutter speed • High light conditions=fast shutter speed
• Find the shutter speed dial on your camera
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Low light = Slow SS
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Shutter speed means…
• Fraction of a second
• 1,2,4,8,15,30,60,125,250,500,1000,2000 • ½, ¼, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250…
• Shutter speed of 1 is double the amount of light then 2.
• Shutter speed of 4 is half the amount of light then 8.
• Each halving or doubling is called one “stop”
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Mechanical vs. Electronic – Some shutters are mechanical – gears and springs. – Some shutters are electronic.
– Electronic shutters offer half stop or third stop increments…. 90 (between 60 and 125) usually quiet and more accurate than mechanical shutters.
– Mechanical shutters do not depend on batteries to work.
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B and T
• B = bulb • T = time
• Very long or time exposures. • Very dark lighting conditions.
• B stays open as long as you keep the shutter button pressed down.
• T Press the button – shutter is open until you press it again…then it closes.
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Controlling Movement
• 1,2,4,8,15,30,60,125,250,500,1000,2000
• Faster shutter speed = movement freezes
• Slower shutter speed = movement is blurred.
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Freeze/Blur
• Freeze a walking dog at 1/125 • Freeze the motion of a galloping horse at
1/1000 • May photograph the horse at 1/125 to blur
it. • Still subject like a rock – you may use a
slow shutter speed. 1/60 ***Slow shutter speeds may result in blur
due to camera shake.
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500
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60
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30
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8
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Stop Motion
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Blur
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