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Cameras 101
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Cameras measure light
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Step 1 Open aperture
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Step 1 Open aperture Step 2 Detect photons...
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Step 1 Open aperture Step 2 Detect photons... Step 3 Close aperture
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More photons -> Brighter area
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Fewer photons -> Darker area
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Overall photo brightness = "Exposure"
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Underexposed
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Overexposed
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!
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3 parameters
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Aperture
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Aperture Bigger Hole = Brighter
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Aperture Bigger Hole = Brighter Bigger Hole = Smaller "f-stop"
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Aperture Bigger Hole = Brighter Bigger Hole = Smaller "f-stop" f/1, f/1.4, f/2.0, f/2.8, etc. ½ ½ ½
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Shutter Speed
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Shutter Speed Slower = Brighter
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Shutter Speed Slower = Brighter Measured as duration
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Shutter Speed Slower = Brighter Measured as duration 2s, 1s, ½s, ¼s, etc. ½ ½ ½
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ISO
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ISO Higher = Brighter
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ISO Higher = Brighter No meaningful units
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ISO Higher = Brighter No meaningful units 100, 200, 400, 800, etc. 2 2 2
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1 Brightness... ... ∞ combinations
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L'art
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Aperture Depth of Field (DoF)
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f/5 f/11
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Shutter Speed Freeze/Blur Motion
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½s 1/640s
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ISO Compensation*
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f/2.8 1/100s ISO 1600
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Camera Modes Auto -> P -> {S, A} -> M
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Automatic (Auto)
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Camera guesses exposure
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Camera guesses exposure Camera sets all parameters
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Program (P)
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Camera guesses exposure
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Camera guesses exposure User adjusts exposure
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Camera guesses exposure User adjusts exposure Camera sets all parameters
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Shutter Priority (S)
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Camera guesses exposure
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Camera guesses exposure User adjusts exposure
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Camera guesses exposure User adjusts exposure User Shutter Speed applied
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Camera guesses exposure User adjusts exposure User Shutter Speed applied Camera sets Aperture, ISO
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Aperture Priority (A)
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Camera guesses exposure
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Camera guesses exposure User adjusts exposure
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Camera guesses exposure User adjusts exposure User Aperture applied
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Camera guesses exposure User adjusts exposure User Aperture applied Camera sets ISO, Shutter Speed
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Manual (M)
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User sets Aperture, ISO, Shutter Speed
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First step: Use P mode
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First step: Use P mode Last step: Use A or S modes
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Other fun stuff includes...
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Framing
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Framing
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Framing Flash
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Framing Flash Processing
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Framing Flash Processing
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Framing Flash Processing Focal Length
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Framing Flash Processing Focal Length Sensor Size
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Framing Flash Processing Focal Length Sensor Size White Balance
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Don't stop snapping!
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Fin www.cambridgeincolour.com