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OPERATION


The sensor records the view through the lens, the view is processed, and finally projected on a miniature display which is viewable through the Eyepiece . Electronic viewfinders in digital Still Camera s are very similar to those in Video Camera s.


ELECTRONIC VIEWFINDERS IN STILL PHOTOGRAPHY


Electronic viewfinders have the following advantages over optical viewfinders:
  • Lack of Parallax , without the need for a bulky Reflex Mirror . Cameras with a separate optical viewfinder show the scene from a different viewpoint than that of the camera lens.

  • Information about the scene, such as a Histogram , can be overlaid with the scene.

  • EVFs can show an approximation of the final exposure when they are exposure-priority.

  • EVFs can show a low-light scene brighter than it is when they are display-priority.

  • Most EVFs show 100% coverage of the final image.


Electronic viewfinders have the following limitations ( 2007 ):
  • There may be a noticeable lag between the changes in the scene and the electronic viewfinder display.

  • The Resolution of the display may be too low to allow for accurate manual Focusing . Some cameras assist in this by magnifying the center of the image or by outlining the edges of in-focus objects.

  • In low-light conditions, an EVF display that does not auto-gain can be virtually blank, making it difficult to use. In practice, very few EVF displays do not auto-gain.

  • An EVF has high power consumption, usually equivalent to the main LCD screen.


Many professional Photographer s and advanced amateurs prefer Digital Single-lens Reflex cameras which provide a traditional optical viewfinder (OVF). Beginning in 2006 some new digital SLR camera models provide both traditional Through-the-lens viewing and a full-time " Live Preview " on the LCD display. These include the Olympus E-330 , E-410 and E-510 , the Panasonic Lumix DMC-L1 , the Leica Digilux 3 and the Canon EOS-1D Mark III .


SEE ALSO