presentation (small size) Week 2. Review Homework ... Exposure: Shutter speed, aperture, ISO The camera’s

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  • Week 2

  • Review Homework Assignments

  • Review Last Session

  • It’s not that simple…

    T 1/125 1/160 1/200 1/250 1/320 1/400 1/500

    A 4.0 4.5 5.0 5.6 6.3 7.1 8.0

    ISO 100 125 160 200 250 360 400

    Modern cameras have 1/2 or 1/3 stops for shutter speed, aperture and sometimes ISO.

    Get familiar with what your camera does and remember the “full” stops.

  • Camera View Finder

    • (Almost) the same picture as the sensor will see

    • Focus Point(s)

    • A lot of data

  • View Finder Frame Accuracy

    • Canon EOS 60D: 96%

    • Canon EOS Rebel T2i: 95%

    • Nikon D40: 98%

  • Nikon D40 Viewfinder

    http://www.imaging-resource.com/CAMDB/print_page.php?directory=ND40&page=viewfinder&model_name=Nikon%20D40

    http://www.imaging-resource.com/CAMDB/print_page.php?directory=ND40&page=viewfinder&model_name=Nikon%20D40

  • Canon EOS 60D

    Canon Rebel T2i is similar, but does not have a battery indicator.

  • Other Displays • Exposure Info (shutter, aperture, ISO)

    • Exposure/Focus Lock

    • Exposure Compensation

    • Electronic Level (some cameras)

    • Image review

    • Histogram

    • Other Status Information (drive mode,

    flash, ...)

  • An Experiment

  • Determine Correct Exposure

    • Camera Meter

    • What does it measure?

  • 18% Gray

  • Scenarios

    • Take a picture of a white rabbit in snow

    • Take a picture of a black cat on black velvet

    • What do we get?

  • Rabbit or Cat?

  • Exposure Compensation

    • When taking pictures in extreme lighting conditions of extreme brightness levels

    • For snow, over-expose by 1.5 to 2 stops

    • Use the exposure compensation function

    of your camera

  • Histogram

    • To judge the right exposure

    • Need to compensate for extreme

    situations (e.g. snow or very dark situation)

    • http://www.kenrockwell.com/tech/ histograms.htm

    http://www.kenrockwell.com/tech/histograms.htm

  • I don’t have a 18% gray card!

  • Yes, you do!

  • The Palm Trick

    Measure the palm of your hand so that the light that hits the scene also hits your palm.

    Then “open up” one stop (e.g. go from aperture 8 to 5.6, or from 1/500s to1/250s)

  • Metering Exposure: Shutter speed, aperture, ISO

    The camera’s meter will take the selected ISO into account, an external meter needs to be configured correctly.

    Metering will result in a combination of exposure settings.

    Any equivalent exposure can be used.

  • Metering Modes

    • Evaluative or Matrix Metering

    • Center-weighted average Metering

    • Spot (or partial spot)

  • How to Meter?

    • Group photo with light coming from the font

    • Beach scene with backlight

    • Portrait

    • Landscape

  • Handheld Meters

    • Reflected Light

    • Incident

  • Cheaper Alternative

    http://www.esdevices.com/products/luxi

  • Assignment

    Find  different  scenes  that  require  different  metering  modes.   Take  three  pictures  for  each  scene  using  all  three  metering   modes.  Take  a  fourth  picture  using  your  “built-­‐in”  gray  card   to  determine  the  correct  exposure