HOW CAMERA WORKS

In this post you will see how the camera actually works. I’ll tell you step by step.

MAIN PARTS:



Lens



Diaphragm



Shutter



Exposure control



Viewfinder



LENS:



It consists of two surfaces one is concave (curving) and other is convex (bulging inward). There are generally three types of lens. Normal, wide angle and the last telephoto lens. the image size determine by Lens’s focal length that will be produced in a film. Now what is focal length? ..  light rays focus through the lens at this point. The viewing field is approx 50 degrees in normal lens. The objects arise normal in size and shape, relatives to the picture’s background.





In wide angle lens the field of view become wider about 90 degrees. when the gap between camera and subject is limited as in (interior photography), this type of lens is generally passed down. It also makes small object look larger.



Telephoto or long focus lenses are the type of lenses which has a  field of view smaller than a normal lens and give enlarged detail of image done with the same film feild. There is interchangeable lens too, the photographer whose lens can be adjusted easily by grave situation. In recent year variable focal length or zoom lenses have become very well knowned and beat many lenses and give photographers a great convenience. the ability of gathering light power of a lens is indicated by the “f” number. themorew light it lets through the more f number .Fast lens has the value of aperture f/2.0.







DIAPHRAGM:



It is the one of the two factors that is used to determine the correct film exposure in the amount of light that is grant to gorge through the lens. Mechanically lessen the aperture better the optical performance particularly at the edge of the picture.depth of the picture increase too which is the good thing it improves the focus.most cameras use other type of diaphragm which is called iris-type. It consists of a number of very thin blades. The size of the opening of the lens can be varied. Blades are mounted to give rotating effect to the ring or lever.number of openings of the diaphragm which is called f stops are marked on the lens mounting.the change in the opening of the diaphragm changes the quantity of light passing through the lens by a factor which is 2. The standard setting of the diaphragm which is used in most of the lenses is 2 2.8, 4 5.6,8,11,16,22 and so on



EXPOSURE CONTROl:



First I’ll tell you about exposure: the state of being exposed to contact with something. Many photographers still used exposure meters to adjust exposure. These meters used to measure the light intensity and indicate what aperture and indicate the aperture and shutter speed whether it is appropriate to film type used.now automatic exposure system came to market.also many new instruments released in the market which help professionals to control exposure according to their demand.



Nonreflex cameras such as selenium (it is a toxic nonmetallic compound related to sulfur) cell is used to mount to the lens and measures the amount of the light and adjust the blend of lens aperture and shutter speed and gives a very good quality negative.



Single lens reflex cameras fitted with through the lens metering system(TTLs) which helps in automatic control of exposure.light sensing cell also adjusted in inside the camera to sense optical path and gives the most accurate reading of the victorious light condition.all the information is processed by the electronic circuit design built into the camera, the shutter and aperture speed are set accordingly.



THE VIEW FINDER:



It is defined as the area covered by the lens is in use on the camera. The most original type is a simple frame of wire mounted on top of the lens. Proper eye position is determined by a vertical post mounted at the back of the camera. The view seen through the frame with the post in the center is equal to the area covered by the lens.