At the same time, on cameras with smaller sensors, for example, on Canon Elph 360 point-and-shoot camera, 54 mm focal distance of its lens is equivalent to the 300 mm telephoto lens on a 35 mm camera.Ī 50 mm lens on a 35 mm camera becomes an 80 mm lens on an APS-C camera
On any 35 mm film or 24 × 36 mm sensor camera, a 35 mm lens is a wide-angle lens, a 50 mm lens is a “normal” lens, which best approximates human vision, and a 500 mm lens is a telephoto lens. Why? Because 24 ×nbsp 36 mm is the most common camera format and most photographers are familiar with the 35 mm film format. Usually, the standard sensor size is used for comparison, which has a full-frame size of 24 ×nbsp 36 mm. This is why the angle of view of the lens is determined by both its focal length and the sensor size. The image formed by any lens in the focal plane of a camera is circular and the size of the film or sensor determines how much of this circle is used to create a picture. Sizes of image sensors range from the tiny 1/4“ (3.2 × 2.4 mm) up to ones as large as a 35 mm frame (24 × 36 mm), which is called a full frame sensor there are also medium format sensors, which is roughly twice the size of a full-frame sensor Most photographers who are experienced with interchangeable lenses worked with 35 mm cameras. Because 35 mm cameras dominated the market since the early 1930s, this format is always used for the comparison of lenses made for various sizes of image sensors. The magnification and angle of view of a lens depend not only on the focal length, but also on the size of the image sensor or film. It will also be useful for those who are thinking about buying a new camera with a different size of a sensor and want to find out if their old lenses will work on a new camera and how they will shoot. Experienced photographers, however, who are accustomed to 35 mm cameras, will find this characteristic very useful. This characteristic is not needed for beginners, those who bought their first camera because the equivalent focal distance will not tell them anything. If the sensors are different, then, all other things being equal, the focal lengths of the lenses of the two cameras should be different. We are talking about the equivalent focal length in order to understand how the focal length of the lenses of two cameras should differ if we want to obtain similar looking pictures with the same angle of view using two different cameras having different sensor sizes and without changing our physical position relative to our object.
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