In the camera canon np-e3 battery, no image area or screen size reference, lens focus is meaningless. Like volume of such simple, a 75mm lens for 4 x 5 camera is a wide Angle lens. This one is the same 75mm lens for 6 x 6 (medium format) camera, is a "standard" lens. The camera for APS cameras, is a telephoto lens. For miniDV cameras for, it is a super telephoto lenses.
When the lens used for a small format sensor (any digital SLRS sensor 35mm format) are less than, its function is very like a a telephoto lenses in the role of a 35 mm film cameras canon digital ixus 750 battery. Amplification coefficient are usually an approximate value, tell you the same a lens in digital camera and 35 mm film cameras, the creation of the same image difference. The coefficient of different according to the camera change, change range 1.5 to 2 times. Then, you can get a with 35 mm film camera lens, equivalent to 35 mm film camera reference value.
35mm equivalent focal length is as with most photographers related. The numerical use because manufacturers want to let the photographer to have shot himself, use digital SLRS. Unfortunately, the size of the 35mm sensor technology made great cost, so manufacturers smaller sensor, and small sensor in effect is obtained different forms,. These sensors are used to 35 mm lens camera on the fuselage of the same lens, image, so commonly compared them with film the only method is to use the amplification coefficient (the so-called equivalent of 35mm camera ? ? ? ? ? ?). Since lens by the influence of Angle, and at least square has four different digital format (different sensor size) used in digital SLRS, talked about the camera Digital Camera Battery is the best way is to use a 35mm equivalent of practice.
