Chapter 3 Flashcards
Define Bracketing:
General technique of taking several shots of the same subject using different camera settings.
Define Overexposure:
Where there is no film, overexposure refers to a white-looking or washed-out image (overexposed image). This generally happens when a digital photo or video was shot with too much light on the subject.
Define Underexposure:
Photographic negative or print that is imperfect because of insufficient exposure.
What will the photograph look like if there is too little exposure?
The image will become too dark
What will the photograph look like if there is too much exposure?
The image will be too bright
Which two adjustments on the camera control the amount of light reaching the image sensor?
When you take a photo, the sensor is exposed to light for a fraction of a second, or sometimes longer. The ISO, speed and aperture. They all combine light into their work to be able to make things look smoother and more unified. It makes your image look normal.
Explain how the modes work: Automatic mode
The camera determines all aspects of exposure, choosing exposure parameters according to the application within the constraints of correct exposure, including exposure, aperture, focusing, light metering, white balance, and equivalent sensitivity. For example in portrait mode the camera would use a wider aperture to render the background out of focus, and would seek out and focus on a human face rather than other image content. In the same light conditions a smaller aperture would be used for a landscape, and recognition of faces would not be enabled for focusing.
Explain how the modes work: Shutter-priority mode
The photographer chooses the shutter speed that he wishes to shoot at and lets the camera make a decision about what aperture to select to give a well exposed shot.
Explain how the modes work: Aperture-priority mode
The photographer sets the aperture that he wishes to use and the camera makes a decision about what shutter speed is appropriate in the conditions that he’s shooting in.
Explain how the modes work:Manual mode
The photographer control over the various parameters of an exposure. There are three exposure parameters – aperture, time (shutter speed), and sensitivity (ISO), and in different modes these are each set automatically or manually; this gives 23 = 8 possible modes. For a given exposure, this is an underdetermined system, as there are 3 inputs but only 1 output. Accordingly, there are many combinations that result in the same exposure – for example, decreasing the aperture by one stop but increasing the exposure time or sensitivity to compensate, and there are various possible algorithms to automatically choose between these.
Define Shutter:
A device that opens and closes to expose the film in a camera. Determines the amount of time the sensor receives light.
Define Shutter speeds:
How fast the device that opens and closes to expose the film in a camera shuts to allow light in.
On a bright sunny day, you would tend to use a (slower / faster) shutter speed.
Faster, use a smaller shutter speed, you have lots of light so your exposure is going to allow you to go faster.
To photograph a dark interior, you would tend to use a (slower / faster) shutter speed.
A slower shutter speed. Its open longer so you can retain the image.
As the shutter speed changes from 1/250 to 1/500, is more light striking the image sensor?
The faster the speed the more light, the lesser the speed the less light. Less light is getting to the sensor.
