how to expose
TRANSCRIPT
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How to make an Exposure
The Trinity and Beyond
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White Balance
• AWB-auto white balance• Daylight• Shade• Cloudy• Tungsten• Flourescent• Flash• Custom
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The Trinity-Aperture
• Controls how large the opening is that lets light through to the sensor
• Called f-stops• Full stops
– 1,1.4, 1.8, 2.0, 2.8, 3.5, 4, 5.6, 8, 11, 16, 22,32
• Controls depth if field• The higher the number the smaller the aperture hole
is• The higher the number the more depth of field• To change the aperture press the AV button while
scrolling with the main dial
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Depth of Field
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The Trinity-Shutter Speed
• Controls how long light passes through to the sensor• Change shutter speed with main dial• Can be anywhere from 1/4000 second to 1 second to
minutes• 1/500=one five hundredth of a second• 1” = one second• Anything under 1/60 will have motion blur from your
hands shaking (called camera shake) • Bulb setting-shutter stays open as long as you press
the button
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Fast Shutter Speed
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Slow Shutter Speed
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ISO
• Controls how sensitive your sensor is• Runs in multiples
– 50, 100, 200, 400, 800, 1600, 3200
• 100-400 for bright light• 400-800 for less light• 1600 for very dark situations
– After 800 you begin to have lots of noise
• Your ISO will affect the choices of aperture and shutter speed available to you
• A higher ISO will allow you to use faster shutter speed
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Add all three and you have an Exposure
• Now we have to combine all three to make our exposure
• Set your white balance
• Set your ISO
• Make choices about aperture and shutter and use your light meter to get the correct exposure
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Light Meter• Measures the light coming into the camera• This measurement allows you to choose the
correct aperture and shutter speed• Press the shutter release half way down to get a
light meter reading• The goal is to get the blinking bar in the center of
the light meter bar• Choose a aperture or shutter speed that you want
to start with and then then scroll with the other (aperture or shutter speed)until you have the bar in the middle
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Underexposed Overexposed
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Summary of Making an Exposure
• Set your white balance• Set your ISO• Choose your shutter speed or aperture• Use your light meter to get the
corresponding shutter speed or aperture• Take the photo and check your LCD to
see if it is properly exposed