Understanding Exposure in DSLR Cameras M. P. Hariharan Civil Design Engineer Joint Operations, Kuwait
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8/12/2019 Understanding Exposure in DSLR Cameras
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Understanding Exposure in DSLR Cameras
M. P. Hariharan
Civil Design Engineer
Joint Operations, Kuwait
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DSLR Strengths / Weakness of Point
& Shoot
DSLR Weakness/Point & Shoot Strengths :
-Image Quality - Price
- Adaptability - Size & Weight
-Speed - Maintenance
-Optical View Finder - Noise
-Large ISO Range - Complexity
- Manual Controls
- Depth of Field
-Quality Optics
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Aperture Setting Relative Light Example Shutter Speed
f/22 1X 16 seconds
f/16 2X 8 seconds
f/11 4X 4 seconds
f/8.0 8X 2 seconds
f/5.6 16X 1 second
f/4.0 32X 1/2 second
f/2.8 64X 1/4 second
f/2.0 128X 1/8 second
f/1.4 256X 1/15 second
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Narrow Aperture
f/16 - high f-stop number
large depth of field
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Shutter Speed Typical examples
1 - 30+ seconds Specialty night and low-light photos on a tripod
2 - 1/2 second To add a silky look to flowing water
Landscape photos on a tripod for enhanced depth of field
1/2 to 1/30 second To add motion blur to the background of a moving subject
Carefully taken hand-held photos with stabilization
1/50 - 1/100 second Typical hand-held photos without substantial zoom
1/250 - 1/500 secondTo freeze everyday sports/action subject movement
Hand-held photos with substantial zoom (telephoto lens)
1/1000 - 1/4000 second To freeze extremely fast, up-close subject motion
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Exposure
Mode
How It Works
Auto ( ) Camera automatically selects all exposure settings.
Program (P)
Camera automatically selects aperture & shutter speed; you can
choose a corresponding ISO speed & exposure compensation.
With some cameras, P can also act as a hybrid of the Av & Tv
modes.
Aperture Priority
(Av or A)
You specify the aperture & ISO; the camera's metering determines
the corresponding shutter speed.
Shutter Priority
(Tv or S)
You specify the shutter speed & ISO; the camera's metering
determines the corresponding aperture.
Manual (M)You specify the aperture, ISO and shutter speed— regardless of
whether these values lead to a correct exposure.
Bulb (B)
Useful for exposures longer than 30 seconds. You specify the
aperture and ISO; the shutter speed is determined by a remote
release switch, or by the duration until you press the shutter
button a second time.
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