The lens is part of the door opening for entering light into the camera. The lens collects light from an object and project it into film.

Lens is the important parts of a camera because the lens determines the resulting picture. Either its a good picture or a bad picture. The lens aperture size determines the amount of light entering. If the lens aperture diaphragm is too large, then the light coming in too much so that the resulting picture will be too bright (over-exposure). Conversely, if the lens diaphragm aperture is too small then the light coming in too little so that the resulting picture will be dark (under-exposure).

Lenses are usually written on the strength of the lens opening, as on the camera lens Canon EFS 18-55mm: ‘CANON ZOOM LENS EFS 18-55mm 1:3.5-5.6 IS’. Thus, the mean power of the lens at aperture f/3.5 maximum aperture at 18mm and f/5.6 at 55mm.

The types of lenses in cameras, namely:
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    1. Wide-Angle Lens : Shooting with a long angle, such as architecture, interiors and landscapes. The length of the lens between 17mm until 70mm. Be careful with wide angle lenses because of your background image will be smaller and far from that seen with your eye viewpoint.

    2. Normal Lens (Standard) : Angle of view comparable to that seen the human eye. Lenses of this type usually used to shoot in the studio. Length 50mm lens (fixed lens).

  • Telephoto Lens : For long-distance shooting, like shooting a journalistic and sports coverage. The length of the lens between 70mm until 300mm.

Besides the above three types of lenses, there is also some lenses which is a function of the merger or the development of lenses, such lenses Zoom, Macro, Super Wide Angle, Fish Eye. This type of lens is called lens variations or special lenses.

Thanks for your attention,