Fully Automatic Mode

The "fully automatic mode" is an extension of the program mode auto exposure (P). This mode is usually distinguished by a colour (most commonly green). This fully automatic operation uses the diaphragm as well as exposure time to control image exposure. Some manufacturers have introduced a function to change the ISO rate, depending on the requirements, in order to minimise the risk of blurring. On some cameras the ISO rates are limited for users (ISO max). This makes sense as image quality can be considerably reduced by a higher ISO rate. Then however (and not only then), you need pay attention to exposure time to able to estimate the risk of blurring. This mode coupled with right focusing technique (and possibly an image exposure correction) is very well suited for capturing subjects.

Pressing the shutter release – processes:

  • Focusing
    • The camera should realise which subject it needs to focus in on, i.e. what is important to the photographer. This may vary considerably and can cause the camera to “misjudge”.
       
  • Measuring the subject’s brightness at various points of the image
    • Evaluation of information on brightness and implementation of it using these settings:
      • Exposure time
      • Diaphragm
      • ISO rate
    • The camera must also register where the main subject of the picture is, i.e. what is important to the photographer. This may vary considerably and can cause the camera to “misjudge”.

This simplified presentation of the various processes involved with the shutter release already shows two significant problems when it comes to using fully automatic functions. The core of problem lies in the fact that a camera cannot guess the photographers creative purpose of capturing a certain image. To counteract this problem, it is imperative to focus on focusing, exposure measurement and exposure control.

 

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