In order to facilitate in real photography jvc gr-d30u charger calculation with unified exposure and to measure different lens aperture aperture, the actual role adopt "relative aperture" concept.
Aperture say again aperture aperture, is the important mechanical device, shot by changing its role is the effective optical lens aperture, control the light through a lens, thus make the ability of photographic jvc gr-d93us charger components or film get accurate exposure, and can control of the depth of field, or adjust the imaging quality lenses. Aperture are in lens aperture, usually by more pieces inside the metal blades can be activities (called the aperture of blade), can undertake no series of adjustment. Aperture institutions by mechanical or electric, can electromagnetic device driver, also can manual adjustment.
Aperture position
Due to the different lens aperture from different locations, focal length, diameter of different incident pupil with aperture is not identical also, described the light ability, general lens cannot achieve different lens comparison. In order to facilitate in real photography calculation with unified exposure and to measure different lens aperture aperture, the actual role adopt "relative aperture" concept.
Relative aperture = [focal length of the lens] / [incident pupil diameter] = f/d
Usually indicate relative aperture method is in relative aperture front join [f /] or f, such as f / 1.4, f / 2, f / 2.8 etc, f/or f numerical smaller, behind the transmittance level; Digital is larger, the smaller the transmittance level. With such standardized way, for different lens, shutter speed, under the condition of invariable, same as f numerical exposure is the same.jvc gr-d395us charger
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