Singularities Of The Digital Camera, Terms And Concepts Part 2

Focal distance (an equivalent for 35-mm)

The focal distance is a distance which transits ray, refracting in a lens, to a point on a film where the image is printed. If the focal distance less, the more shooting corner will be, hence, more capacious frames turn out. At a row of models the focal distance is fixed and designated by one digit. Other models have ZOOM that allows increasing focal distance several times in a certain interval for shooting of remote objects. At mirror cameras the focal distance can change at the expense of lens change. The focal distance of the digital cameras is presented in recalculation on a standard film frame 24?36 the mm received on normal cameras with the minimum focal distance of 35 mm.

ZOOM (zoom lens)

The device for change of focal distance which allows approaching or postponing objects of shooting.

Exposure

Time during which the camera lock remains opened for frame obtaining. It is measured in fractions of a second. Distinguish models of cameras with automatic, constant and manual setting of an exposure.

Diaphragm (wide angle)

It is the adaptation in a lens of the camera for the smooth change of its operating hole through which light and the image get on a matrix. The diaphragm changes according to focal distance which can be switched between wide-angle area and telescaling. Values diaphragms (wide angle) at digital cameras correspond to a wide-angle lens of normal cameras with focal distance less than 35 mm which better approaches for landscape shooting, group pictures, etc.

Diaphragm

It is the adaptation in a lens of the camera for the smooth change of its operating hole through which light and the image get on a matrix. The diaphragm changes according to focal distance which can be switched between wide-angle area and telescaling. Values of a diaphragm at digital cameras correspond to a telephoto lens of normal cameras with focal distance 60 – 80 and more mm which is preferable to portrait shooting.

Type of replaceable storage

Replaceable storage serves for magnification of total amount of storage as the volume of the built in storage of numeral cameras is normally insignificant. Replaceable memory cards are some kind of diskettes for numeral cameras. They meet of three types: PC card ATA Flash (PCMCIA-card), SmartMedia and CompactFlash.

Replaceable storage

It is the storage capacity of replaceable cards. The more replaceable storage, the more pictures it is possible to fix the numeral camera.

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