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Technical Review: the characteristics of the objectives

Characteristics of objectives.

1.Angolo visual focal
2.Lunghezza
(for the 35 mm format)
3.Effetto
4.Distanza minimum focusing
5.Profondità field

WIDE ANGLE
Over 45 Less than 50 degrees
mm
see sweeping vistas and makes items smaller
Less than half a meter
Grande.
It 's easy to focus

NORMAL
45 degrees 50 mm

see how the human eye
Half a meter about
Media

TELEPHOTO
Less than 45 degrees
More than 50 mm
see close views and magnifies objects More than half a meter

Small.
It 'difficult to focus

Zoom.
There are some targets whose focal length varies between two extremes. They are called zoom, because of shift changes rapidly when they produce their focal length. Are there any zoom ranging from a slight wide angle to modest telephoto: for example, 28-80. More ranging from low to medium telephoto telephoto lens, for example the 70-210. Let us remember then that the targets can be fixed focus or zoom (variable focus). Do not confuse the terms fixed focus and fixed focus, which have completely different meanings. The first refers to the focal length of a lens, the second to the fact that some very simple construction of compact machines do not have any device to the focus, either manually or automatically.