Learning How to Produce a good exposure:
"Exposure is based on through-the-lens light meter readings that transmit the luminance of the scene to the camera's onboard computer," says James Fitzharris. The aperature size and shutter speed control the exposure. One important part of attaining the correct exposure is by looking at the histogram graph.
Histogram
The histogram graph displays the amounts of different values of light consisting of a shadow area on the far left, a midtone area in the middle, and a highlight area on the far right. If the graph displays a much greater amount of light on one side than on the other, it means that the exposure is either too dark or too light and that the aperature or shutter speed need adjusting. It is important that you get the exposure right on the first try to aviod missing a great shot. The light meters cannot differentiate between white snow or sand that is supposed to be light from land that is supposed to be dark. If left unadjusted, these areas will be dsiplayed as neutral-gray. Evaluative/matrix metering is the best mode for general-purposes, whereas spot metering only determines the exposure based on merely 6% of the picture, which can be useful when shooting wildlife.
Modes:
The next step is done by manually or automatically adjusting the the shutter speed and aperature. AV or Aperature Priority Mode "is the best mode for subjects because it gives priority to depth of field." The larger the depth of field desired, the smaller the aperature and vice versa. TV mode or Shutter Priority mode allows you to set the speed of the shutter and the camera will choose the aperature. Manual Mode allows you to set both the shutter speed and aperature and is useful when shooting action shots.
Problems:
Difficult lighting and short amount of time to capture a shot can create problems. Always remember that a one notch increase or decrease in exposure makes a significant change. In situations like this it is important to refer to the histogram and make sure that the picture's values are generally balanced. If the picture is darker or lies in a shadow try decreasing the exposure by one notch. To aviod neutral grey areas when shooting white or really bright lit subjects increase the exposure by one or two stops. Sunrise and sunset provide some of the best and most popular lighting to shoot in. To measure the light, do a meter reading of midtone section including the sun.
"Exposure is based on through-the-lens light meter readings that transmit the luminance of the scene to the camera's onboard computer," says James Fitzharris. The aperature size and shutter speed control the exposure. One important part of attaining the correct exposure is by looking at the histogram graph.
Histogram
The histogram graph displays the amounts of different values of light consisting of a shadow area on the far left, a midtone area in the middle, and a highlight area on the far right. If the graph displays a much greater amount of light on one side than on the other, it means that the exposure is either too dark or too light and that the aperature or shutter speed need adjusting. It is important that you get the exposure right on the first try to aviod missing a great shot. The light meters cannot differentiate between white snow or sand that is supposed to be light from land that is supposed to be dark. If left unadjusted, these areas will be dsiplayed as neutral-gray. Evaluative/matrix metering is the best mode for general-purposes, whereas spot metering only determines the exposure based on merely 6% of the picture, which can be useful when shooting wildlife.
Modes:
The next step is done by manually or automatically adjusting the the shutter speed and aperature. AV or Aperature Priority Mode "is the best mode for subjects because it gives priority to depth of field." The larger the depth of field desired, the smaller the aperature and vice versa. TV mode or Shutter Priority mode allows you to set the speed of the shutter and the camera will choose the aperature. Manual Mode allows you to set both the shutter speed and aperature and is useful when shooting action shots.
Problems:
Difficult lighting and short amount of time to capture a shot can create problems. Always remember that a one notch increase or decrease in exposure makes a significant change. In situations like this it is important to refer to the histogram and make sure that the picture's values are generally balanced. If the picture is darker or lies in a shadow try decreasing the exposure by one notch. To aviod neutral grey areas when shooting white or really bright lit subjects increase the exposure by one or two stops. Sunrise and sunset provide some of the best and most popular lighting to shoot in. To measure the light, do a meter reading of midtone section including the sun.
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