WHAT IS A CAMERA ?
A camera is a device used to capture images, either as still photographs or as sequences of moving images (movies or videos). The term comes from the Latin camera obscura for "dark chamber" for an early mechanism of projecting images where an entire room functioned as a real-time imaging system; the modern camera evolved from the camera obscura.
FEW TERMS RELATED TO CAM's.....
APERTURE
In optics, an aperture is a hole or an opening through which light is admitted. More specifically, the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane.
f-stop
In optics, the f-number (sometimes called focal ratio, f-ratio, or relative aperture[1]) of an optical system expresses the diameter of the entrance pupil in terms of the effective focal length of the lens; in sim
pler terms, the f-number is the focal length divided by the aperture diameter. It is a dimensionless number that is a quantitative measure of lens speed.
Depth of field increases with f-number.This means that photos taken with a low f-number will tend to have one subject in focus, with the rest of the image out of focus.
A FEW CHECK POINTS WHILE BUYING A CAM :-
1> Resolution.
2> Zoom (more the optical zoom better is the camera , optical preferred over digital zoom).
3> Image quality i.e High pixel size.
4> Red-Eye-Reduction-Flash.
5> High ISO support (50,100,.......3200).
6> Aperture speed setting (for low light fast lens is required).
7> USB 2 support.
8> Built in microphone.
9> Weather protection.
10> D-lighting.
11> large LCD screen.
12> Lens shift vibration reduction.
13> Size.
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