Photography: 3 - Shutter Speeds

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CONTAINS EMBEDDED ANIMATIONS - DOWNLOAD FOR FULL EXPERIENCE! A quick recap on lenses - then some fun with shutter speeds!

Text of Photography: 3 - Shutter Speeds

  • Lenses are come in different sizes: 70mm = Telephoto Zoom = Combines all three into one 24mm 50mm 70mm
  • DOF refers to how much of a photo is in focus: The smaller the f-number, the smaller the DOF:
  • In your camera between the lens and the film/CCD - is the shutter Video on next slide
  • http://www.youtube.com/watch?v=lw6doYnO4ng
  • Think of it as a door that opens for a split second to allow the image of your subject to burn onto the film/CCD
  • As the photographer you have control over how long this door is open Typically this will range from 1/1000th of a second (very, very fast) to 1 or 2 seconds (very slow)
  • The longer the shutter is open, the more chance there is that something in your subject will move, for instance the train appears still
  • But at a slower shutter speed the train has travelled an inch or so while the shutter was open so the train blurs
  • And at a very slow speed the train moves so much that it barely registers on the photo and becomes ghost-like
  • Notice the blurred horses legs
  • Faked with Motion Camera Android phone app Not true motion blur Lo Res images (480x320)
  • Notice the sharpness of the legs
  • If you use a shutter speed slower than 1/60th of a second your photos will suffer from camera shake (your hands cant hold a camera that still for that long!):
  • Slow Fast or in old money
  • For slow speeds youll need a tripod: or wedge your camera against something solid:
  • Fast Shutter Speed Slow Shutter Speed
  • Either: Set your camera to Shutter Priority mode and take a series of photos of the same moving subject at different shutter speeds Or, if your camera does not have Shutter Priority, go to www.camerasim.com and experiment with the shutter speed slider
  • A Quick Overview
  • Opening the shutter exposes the film/CCD to light Too little light causes under-exposure, too much causes over-exposure:
  • Youll remember that Aperture gives us Depth of Field by changing the size of an iris in the lens: Think of the iris as a curtain that you can open or close
  • By opening or closing the iris you control the amount of light getting through it just like closing a curtain to block out the sun on a bright day This can be used to compensate for under or over exposure, so the iris can be opened (perhaps to f2.8) to let in more light when using a fast shutter speed, or the iris can be closed (f16) to let in less light with a slow shutter speed
  • Fast Shutter / Wide Aperture (f2.8) Slow Shutter / Narrow Aperture (f16)
  • This is the tricky part of photography to get your head around Well keep coming back to it over the next few weeks >>>END