How Does The Zoom Cameras

How Does The Zoom Cameras

Almost all digital cameras, including the most basic entry-level models, are equipped with compact zoom lenses and often powerful (in terms of magnification). Zoom lenses are so widespread and so often used in the shots newspapers that now no one stops to think more how they work or how they are made: we just press a button or turn a dial to set it in motion and then we take the photograph.

In recent years great strides have been made in the context of the zoom lenses in terms of optical quality akusaraprosound, brightness and miniaturization, but the roots are also in a very remote past: in fact, the first zoom in moving parts (therefore able to change the focal length) were used in 1834 in astronomy and military to “zoom in” distant objects. Subsequently, in 1932, he appeared the first target can correct optical aberrations while, in 1959, was placed on the market the first zoom lens for cameras.

Subsequently, they have followed zoom more and more high technology, equipped with autofocus, high brightness, of small dimensions. In short, the real gems of technology that continue to evolve at an impressive rate.

In the market there are different models of zoom based on different designs, but all share the same principle of operation: a zoom is a set of lenses of shape, pattern and different thickness that move (some of them) to one another to change the magnification of the shooting scene without changing the focus. Wanting to outline the operation of a zoom lens, we can see the two images below.

In the two diagrams is visible twice lens group: the fixed ones (the elements of focus) and the mobile (the elements magnification). The key element is obviously the movable concave lens, whose function is to disperse the light path. The concave lens, moving in the space between two convex lenses (beginning and end of stroke), changes the width (or dispersion) of the light rays that enter to the left of the drawings, modifying in this way the magnification. Obviously, the dispersion of the light rays means that you lose the focus, the problem corrected by the rear elements of the lens system, which concentrate the rays on the sensor of the camera image is guaranteed nitida.Nella schematization above, we can see the positions its lens when the lens is set to wide angle.

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