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exposure part 2.ppt - Meetup

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									              JRCC
Further Tips to Acheiving a Poper Exposure
              Tools
• On your DSLR, there are several tools
  to be used to achieve a proper
  exposure.
• The Shutterspeed + Aperture (f/stop)+
  ISO
         Shutterspeed
• the length of time the shutter is open,
  exposing the Sensor to light.
• measure in time shutter is open.
• 1/8000 of a second is fast
• 1/80 of a second is slow for a 100mm
  lens
• 1” is a second-point at which you must
  have a tripod
• 5” is 5 seconds_ point at which you
  must have a tripod
               Aperture
• The size of the opening behind the
  shutter. It determines the amount of
  light that is able to pass during the
  opening of the shutter.
• It also determines the DOF (depth of
  field)
• You want narrow DOF for portraits,
  typically.
• You want wide DOF for Lanscape
                ISO

• How sensitive you sensor is to light.
• Noise will become more noticable at
  higher ISO’s, depending on the quality
  of your camera.
This sounds like a lot!

• It’s a lot to think about, but it’s like
  driving a car. You learn things and use
  them one at a time, until you can do
  them all at one. You have to learn how
  to change your ISO, SHUTTERSPEED,
  AND APERTURE “..on the fly”
 this is the important
• Use your first step meter to
           camera’s incidental
  assess the amount of light in your
  scene. You choose how it weighs the
  light.
• Spot meters what on the spot you
  choose, and yes, you can move that
  spot.
• Center weighted measures the light in
  an area.
• Evaluative measures all of the light in
       what and why
• Use your vision and brain to assess the
  scene.
• If there’s a bit of sun in the scene, it will
  change the measurement. Look for
  whites, blacks, and midtones, snap an
  image, then view Histogram to see what
  the camera saw.
    what and why 2
• Quick moving subject, faster
  shutterspeed.
• DOF and amount of light and
  shutterspeed will determine aperture.
• If you cannot get a proper shutter
  speed, increase ISO to help, keeping in
  mind you’re bringing in more noise the
  higher ISO you go.
      what and why

• slow moving subject (landscapes,
  etc...), use a tripod and longer shutter
  speeds with a smaller aperture (f/12-
  f/16) to increase depth of field to
  achieve proper exposure. Use ISO if
  necessary.
             Review
• Use shutterspeed and aperture as well
  as ISO to achieve proper exposure.
• what is actully happening in the scene
  will determine settings to use.
• Use meter, then adjust according to
  what the meter tells you, keeping in
  mind what will throw the meter off
  (sunlight in the scene).
          The End


• Questions
• Breakouts

								
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