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Information about Electronic Viewfinder

An electronic viewfinder or EVF is a viewfinder where the image captured by the lens is projected electronically onto a miniature display. The image on this display is used to assist in aiming the camera at the scene to be photographed.

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 cameras are very similar to those in video cameras.

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 photographers 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, the Canon EOS 40D and the Canon EOS-1D Mark III.

See also

viewfinder is what the photographer looks through to compose, and in many cases to focus, the picture.

Viewfinders are widely used in cameras of different types: still and movie, film, analog and digital.

Viewfinders can be optical or electronic.
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For the device for looking through a camera, see viewfinder.


An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes.
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A still camera is a type of camera used to take photographs. Traditional cameras capture light onto photographic film. Digital cameras use electronics, usually a charge coupled device (CCD) to store digital images in computer memory inside the camera, which can be transferred to a
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A video camera is a camera used for electronic motion picture acquisition, initially developed by the television industry but now common in other applications as well. The earliest video cameras were those of John Logie Baird, based on the electromechanical Nipkow disk and used by
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Parallax, or more accurately motion parallax (Greek: παραλλαγή (parallagé) = alteration) is the change of angular position of two stationary points relative to each other as seen by an observer, caused by the motion of an
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single-lens reflex (SLR) camera is a photographic imaging instrument that currently uses an automatic moving mirror system and viewing pentaprism, which is situated between the lens and the film plane to direct the light reflected from the subject's image, then passing
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histogram is a graphical display of tabulated frequencies. A histogram is the graphical version of a table that shows what proportion of cases fall into each of several or many specified categories.
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The display resolution of a digital television or computer display typically refers to the number of distinct pixels in each dimension that can be displayed. It can be an ambiguous term especially as the displayed resolution is controlled by different factors in cathode ray
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Focusing is a naturally occurring human process first observed and made teachable by philosopher and psychotherapist Eugene Gendlin. During his 15 years of research, beginning in 1953 at the University of Chicago, Gendlin analyzed what made psychotherapy either successful or
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photographer is a person who takes a photograph using a camera. A professional photographer uses photography to make a living.

The work of a photographer may be limited to the actual shooting of the camera, or it may include all of the steps in the development of
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digital single-lens reflex camera (digital SLR or DSLR) is a digital camera that uses an automatic mirror system and pentaprism to direct light from the lens through the viewfinder.
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single-lens reflex (SLR) camera is a photographic imaging instrument that currently uses an automatic moving mirror system and viewing pentaprism, which is situated between the lens and the film plane to direct the light reflected from the subject's image, then passing
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Through-the-lens (TTL) metering is a photographic technique in which measurements (usually of light levels) are made through the lens of a camera. The term most often refers to controlling the amount of light emitted from the flash by measuring the light falling back
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live-preview digital camera (LPD) or more precisely, conventionally-generated live-preview digital camera (CGLPD) is a camera that uses a conventionally generated digital image (live-preview) on an electronic screen as its principal means of framing and
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Type Single-lens reflex
Sensor 17.3 x 13.0 mm Four Thirds System Live MOS sensor
2x FOV crop
Maximum resolution 3136 x 2352 (7.4 effective Megapixels)
Lens type Interchangeable Four Thirds mount
Shutter Computerised focal-plane shutter
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Type Single-lens reflex
Sensor 18.00 x 13.50 mm Live MOS
Maximum resolution 3648 × 2736 (10 megapixels)
Lens type Interchangeable Four Thirds System

Shutter speed range 60 s - 1/4000 s

Exposure Modes
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Type Single-lens reflex
Sensor 18.00 x 13.50 mm Live MOS
Maximum resolution 3648 × 2736 (10 megapixels)
Lens type Interchangeable Four Thirds System

Shutter speed range 60 s – 1/4000 s

Exposure Modes
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Type Single-lens reflex
Sensor 17.3 x 13.0 mm Four Thirds System RGB Live MOS sensor
2x FOV crop
Maximum resolution 3136 x 2352 (7.4 effective Megapixels)
Lens type Interchangeable Four Thirds mount
Shutter Focal-plane shutter

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Type Single-lens reflex
Sensor 17.3 × 13.0 mm Four Thirds System RGB Live MOS sensor
2× FOV crop
Maximum resolution 3136 × 2352 (7.4 effective Megapixels)
Lens type Interchangeable Four Thirds mount
Shutter Focal-plane shutter

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Type Digital Single-lens reflex
Sensor 22.2 x 14.8 mm CMOS
Maximum resolution 3888 × 2592 (10.1 megapixels)
Lens type Interchangeable (EF, EF-S)
Shutter focal-plane
Shutter speed range 30 s to 1/8000 s
Exposure Metering
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Type Single-lens reflex
Sensor CMOS
Maximum resolution 3,888 × 2,592 (10 million)
Lens type Interchangeable (EF)
Shutter Vertical-travel, mechanical, focal-plane shutter with all speeds electronically controlled

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Digital photography, as opposed to film photography, uses electronic devices to record and capture the image as binary data. As such, the images can be displayed, printed, stored, manipulated, transmitted and archived using various kinds of digital technology, including personal
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