Presentation on theme: "In Three Parts. » Know ˃What exposure is ˃What affects exposure » Show ˃Define Exposure ˃Identify an over, under, and perfectly exposed photo ˃Use exposure."— Presentation transcript:
» Know ˃What exposure is ˃What affects exposure » Show ˃Define Exposure ˃Identify an over, under, and perfectly exposed photo ˃Use exposure compensation to purposely over and under expose an image » Level of Thinking ˃Understand/Apply
» Box (light-tight) The important components of any camera are:
» Box (light-tight) » Hole or Lens (to let the light in) The important components of any camera are:
» Box (light-tight) » Hole or Lens (to let light in) » Shutter (to open and close to let light in at the right time) The important components of any camera are:
» Box (light-tight) » Hole or Lens (to let light in) » Shutter (to open and close to let light in at the right time) » Film / Sensor (records the light) The important components of any camera are:
» Three things affect how much light comes into the camera: ˃Aperture (opening that lets the light in) ˃Shutter (how long the light comes in for) ˃ISO (how much light is needed to make the picture) » Your camera uses a light meter to measure the light coming in, and sets the aperture, shutter, and ISO so the image will be properly exposed.
Exposure = Total amount of light which hits the film Film and sensors require the right amount of light to produce a ‘correct’ exposure. The settings will be different depending on what you are taking a picture of.
» You can purposely under or over expose a picture on your camera using Exposure Compensation. » Use the exposure compensation controls on the compact cameras to take the same picture five times: ˃-2 stops ˃-1 stop ˃“properly exposed” (according to camera) ˃+1 stop (over exposed) ˃+2 stops » Repeat this for FIVE different setups
» Three settings need to be considered when taking a photo: ˃ISO ˃Aperture ˃Shutter Speed » All three affect the amount of light that reaches the sensor, and how much is needed to get a proper exposure
» “International Standards Organization” » Controls how sensitive the sensor is to light » The more sensitive it is, the less light it needs to take the picture » CATCH: A high ISO causes grain in film photography, now it causes NOISE in digital photography
» Size of the opening in the lens » How MUCH light comes in at once
Do big holes (apertures) let in more or less light ?
F22 f16 f11 f8 f5.6 f4 f2.8 What do you notice about the f number as the aperture gets bigger?
Each aperture is twice as big (or half the size) as the aperture next to it. QUESTION: an f8 aperture lets in twice as much light as f___ and half as much light as f ___
» Aperture affects the DoF in an image » The bigger the aperture, the shorter the depth of field » Think about the aperture setting as being how much of the image is in focus » For instance: f/4, 4 feet in focus versus f/32, 32 feet in focus. Bigger number, more in focus.
» How long (or short) the shutter is open » How LONG the light comes in for
Changes how long the camera lets light hit the sensor A whole number of seconds … 1 second … 2 seconds … 3seconds Or a fraction of a second ½ second … ¼ second …. 1/8 …. 1/15 etc
Shutter speeds are usually given as a fraction of a second and each shutter speed on a camera is normally about twice as long, or half as long as the next shutter speed. Work out the missing shutter speeds in this list: ½ ¼ ___ 1/15 1/30 ___ 1/125 ___ ___ ___
» The shutter speed controls how motion looks in a picture. » The longer the shutter speed, the more blurred the motion will be.
» Find a partner. » Study each situation and determine possible solutions. » Record your solution on notebook paper. » Move on to next station when you are ready. » Return to seat when you are done.