the only three things you need to know about dsrl
DESCRIPTION
All the fancy exposure options a DSLR camera has can be broken down into three things. And these are the only things you must know about it.TRANSCRIPT
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The Only Three things you Need to know about DSLR
A practical guide to exposure
Guilherme Zühlke O’Connortwitter.com/guioconnor
facebook.com/guioconnorPhoto
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Once upon a time…
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Once upon a time…… there was SLR
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SLR – Single Lens Reflex
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SLR – Single Lens Reflex
• A camera with a single lens
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SLR – Single Lens Reflex
• A camera with a single lens
• Use of reflection to send the image to the viewfinder
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SLR – Single Lens Reflex
• A camera with a single lens
• Use of reflection to send the image to the viewfinder
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Back in the old times…
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Back in the old times…
• The body of the camera was responsible for the exposure time
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Back in the old times…
• The body of the camera was responsible for the exposure time
• The lens was responsible for the aperture
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Back in the old times…
• The body of the camera was responsible for the exposure time
• The lens was responsible for the aperture• The film was responsible to hold the projected
image for eternity (or a sub-period of it)
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The camera body
Tipically, a camera body would be set to expose the film for a period of time ranging from 30
seconds to 1/2000 of a second (but your mileage may vary)
http://www.flickr.com/photos/buou/4884738437/
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The Lens
• Has a diafragm that controls the area of the aperture through which the light enters the camera
• The amount of light is proportional to the area of the aperture
(*) See previous presentation on aperture athttp://www.slideshare.net/guioconnor/aperture-in-photography-or-how-boheh-happens
http://www.flickr.com/photos/cycleologist/1454436980/
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The Film
• The film has an emulsion containing silver salts that react to the presence of light
• The more light it receives, the more grains of salt will react
• The coarser the grains of salt the less light you need but the lower the definition of the resulting image(*)
http://www.flickr.com/photos/remediatethis/4353934129/
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(*) That’s the ISO setting for ya
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The correct exposure needs a certain amount of light.
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The correct exposure needs a certain amount of light.
If you want a faster shot, you need a wider aperture. And vice versa.
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Alright, alright. What about DSRLs, then?
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Alright, alright. What about DSRLs, then?
Same thing but with a sensor in place of the film.
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Manual Mode
• Most DSLRs have a manual mode setting
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Manual Mode
• Most DSLRs have a manual mode setting• You set the exposure time
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Manual Mode
• Most DSLRs have a manual mode setting• You set the exposure time• You set the aperture
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Manual Mode
• Most DSLRs have a manual mode setting• You set the exposure time• You set the aperture• Settings are based on the photometer
indication
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Aperture priority mode
• Most DSLRs have an Aperture Priority Mode
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Aperture priority mode
• Most DSLRs have an Aperture Priority Mode• You set the aperture you want to take the
picture on
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Aperture priority mode
• Most DSLRs have an Aperture Priority Mode• You set the aperture you want to take the
picture on• The camera works out how fast (or slow) it
needs to be
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Aperture priority mode
• Most DSLRs have an Aperture Priority Mode• You set the aperture you want to take the
picture on• The camera works out how fast (or slow) it
needs to be• Ideal to control the depth of field
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f/32
f/4.8
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Shutter Priority Mode
• Most DSLRs have a Shutter Priority Mode
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Shutter Priority Mode
• Most DSLRs have a Shutter Priority Mode• You set the exposure time of the shot
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Shutter Priority Mode
• Most DSLRs have a Shutter Priority Mode• You set the exposure time of the shot• The camera works out the aperture
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Shutter Priority Mode
• Most DSLRs have a Shutter Priority Mode• You set the exposure time of the shot• The camera works out the aperture• Ideal to control motion blur
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1/90 s
1/500 s
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But also for extreme light conditions
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Exposure time 104s, barely visible with the naked eye. Shot with ISO 50.See more at http://www.facebook.com/media/set/?set=a.224883254190744.71882.119779558034448
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The ISO setting
• Just as in film
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The ISO setting
• Just as in film• The higher the ISO the less light you need
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The ISO setting
• Just as in film• The higher the ISO the less light you need• The higher the ISO the more noise you have
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The ISO setting
• Just as in film• The higher the ISO the less light you need• The higher the ISO the more noise you have• Different sensors have different qualities for a
given ISO value
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The ISO setting
• Just as in film• The higher the ISO the less light you need• The higher the ISO the more noise you have• Different sensors have different qualities for a
given ISO value• ISO is based on the amount of light needed,
not the amount of grain/noise produced
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ISO 200
ISO 1600
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All fancy exposure settings on your DSLR are based on these three
basic principles.
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?Questions
Further reading• http://www.z-oc.com/blog/2007/08/understanding-cameras-and-photography/• http://www.slideshare.net/guioconnor/aperture-in-photography-or-how-boheh-happens