Nikon 1683 Exposure determination, Exposure display, 1/4000 112000 1/1000 1/500 1/250

Exposure determination

The amount of light reaching the film plane is determined by a combination of the shutter speed and the lens aperture. A shutter speed of 1/500 sec. lets in twice as much light as a set- ting of 1/1000 sec ., and only half as much light as 1/250 sec. An aperture setting of 1111 lets in twice as much light as 1116, half as much as 118. Thus, if the correct exposure for a particular picture -taking situation is 1/500 at 1111, then 1/250 at 1116 or 111000 at 118 will give the same exposure. It is very convenient to know this interrelation when considering depth of field. The following table illustrates the interrelation between shutter speed and aperture.

1/4000 112000 1/1000 1/500 1/250

4 5.6 8 11 16

Exposure display

The LED exposure indicator lamps can be seen on the right side of the viewfield frame within the viewfinder. The shutter speed number and IInumber in use are also visible. The LED exposure display indicates exposure five ways, as shown in the table below, in accordance with the conditions of each exposure.

Overexposure by more than 1 stop

Overexposure by 1/5 to 1 stop

Correct exposure

Underexposure by 1/5 to 1 stop

Underexposure by more than 1 stop

As correct exposure is approached, the LED exposure display inside the viewfinder is liable to change rapidly and easily within the very narrow range, so it is important to turn the lens aper- ture ring and shutter speed dial carefully. Although intermediate shutter speeds cannot be used, intermediate lens apertures can-just turn the aperture ring for fine adjustment.

Note: When the shutter speed dial is set at B (bulb), the LEO exposure display inside the viewfinder is turned off.

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