Camera Basics
A camera captures light photons, usually from the visible spectrum for human viewing, but in general could also be from other portions of the electromagnetic spectrum.
All cameras use the same basic design:
light enters an enclosed box through a converging or convex lens and
an image is recorded on a light-sensitive medium (mainly a transition metal-halide). A shutter mechanism controls the length of time that light can enter the camera.
Most photographic cameras have extra functions that allow to
a person to view the scene to be recorded,
a desired part of the scene to be in focus, and
control of exposure so that it is not too bright or too dim.
On most digital cameras a display, often a liquid crystal display (LCD), permits the user to view the scene to be recorded and settings such as ISO speed, exposure, and shutter speed.
There are following types of Cameras available in present market.
1. Compact Camera
2. DX Format Camera
3. FX Format Camera
4. Medium Format Camera
5. Video Camera or Camcorder
Camera Basic Terminology:
Aperture:
It refers to the opening of a lens's diaphragm through which light passes. It is calibrated in f/stops and is generally written as numbers such as f1.4, 2, 2.8, 4, 5.6, 8, 11,16 and 22. Lower f/stops give more exposure because they represent the larger apertures, while the higher f/stops give less exposure because they represent smaller apertures. This may seem a little contradictory at first but will become clearer as you take pictures at varying f/stops.
ISO:
It represents artificial light to the Processor of camera. ISO range varies from 50 to 100000 varying cameras. If ISO number is set to low, then camera processor gets low light catalyst and while it higher it gets higher light to processor. If ISO gets higher then there are granular starts coming into image so for try to adjust ISO depending upon camera type.
Shutter Speed:
shutter speed is the length of time when the film or digital sensor inside the camera is exposed to light, also when a camera's shutter is open when taking a photograph. The amount of light that reaches the film or image sensor is proportional to the exposure time. Shutter speed is very useful for light painting.
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