light metering
TRANSCRIPT
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Meteringmaking your aperture & shutter speed worktogether to get a well exposed photo
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Film Exposure ?
• film speed
what contributes to
Think about it like being out in the sun!
• aperture setting
• shutter speed
• film speed (sensitivity)
•aperture setting
• shutter speed
what is the weatherlike? how much sun isgetting to you?
how long are you out
in the sun?
how sensitive is yourskin? do you burneasily or tan easily?
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most light
least light
f 2
f 4
f 5.6
f 11
f 16
f 22
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Think about a water faucet and a bucket. The faucet will act as the aperture and a timerfor the shutter speed. The bucket is a properly exposed photograph.
• When you open the faucet all the way (f/2), water rushes out so you fill the bucketin a very short time (1/1000 sec). This would let in a lot of light for a short time.
• When you open the faucet just a little bit (f/16), water barely trickles out and takesmuch more time (1/15 sec) to fill the same bucket.
• It doesn’t matter which combination you choose, the bucket is filled the sameamount, just like a photo can be exposed the same amount by various aperture
and shutter speed combinations while also controlling motion and depth of field.
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ƒ2.8 @ 1/250 sec.
ƒ16 @ 1/8 sec.
These images make use of equivalent exposures - using differentsettings, they accomplish the same exposure - but with differentcreative effects!
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f 2 f 4 f 5.6 f 8 f11 f 16
125
Equivalent Exposures
Point of Departure
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f 2 f 4 f 5.6 f 8 f11 f 16
125
Equivalent Exposures
60
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f 2 f 4 f 5.6 f 8 f11 f 16
125
Equivalent Exposures
60250
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f 2 f 4 f 5.6 f 8 f11 f 16
125
Equivalent Exposures
60250 30
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f 2 f 4 f 5.6 f 8 f11 f 16
125
Equivalent Exposures
60250500 30
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f 2 f 4 f 5.6 f 8 f11 f 16
125
Equivalent Exposures
60250500 30 15
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f 2 f 4 f 5.6 f 8 f11 f 16
125
Equivalent Exposures
602505001000 30 15
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f 2 f 4 f 5.6 f 8 f11 f 16
125
Equivalent Exposures
602505001000 30 15
bracketing:shooting the same photo at different exposures
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f 2 f 4 f 5.6 f 8 f11 f 16
125
Equivalent Exposures
602505001000 30 15
250 125 60
bracketing:shooting the same photo at different exposures
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f 2 f 4 f 5.6 f 8 f11 f 16
125
Equivalent Exposures
602505001000 30 15
250 125 60
bracketing:shooting the same photo at different exposures
f 5.6 f 8 f 11
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Using your camera’s internal light
meter to help you determine how toget a correct exposure.
LIGHT METERING
*
*some older cameras don’t have internal lightmeters - photographers with these cameras can
use external light meters
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f/8125
not exposed
correctly
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f/8125
+ too much light
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- too little lightf/8500
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correct exposuref/8
250
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correct exposuref/8
250
f 2 f 4 f 5.6 f 8 f11 f 16 f 2
250 1255001000 60 30X
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M
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Aperture Priority metering(you choose the f-stop it tells you the shutter speed)
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properly
exposed
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85.6
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Shutter Speed Priority metering(you choose the shutter speed it tells you the aperture)
Too much
light
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22
16
11
85.6
4
2.8
1.4
Shutter Speed Priority metering(you choose the shutter speed it tells you the aperture)
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85.6
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2.8
1.4
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1.4
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0 11 22 +-
One stop overexposed
8 60
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Your camera’s ROBOT EYE (a.k.a.the light meter/sensor) is trying tolook at what you’re photographingand find the MIDDLE VALUE.
THE ROBOT EYE
If you try to get a light meter reading from a reallydark or a really light area, your picture will notcome out well because the robot eye will think thatis the middle value.
Instead, try to meter from something IN THE SAMELIGHT as your subject, that really is a middle value.(Or you can use a grey card!)
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1/40f 5.6
1/20f 5.6
metering from grey card
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1/20f 5.6
metering from grey card
1/20f 5.6
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split image focusing
Movement:
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Movement:move the subject, move the camera, freeze the action
1/30
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Point of View:get low, look down, turn sideways,get underneath, crop, zoom