Nikon N65 Instruction Manual page 103

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Flash shooting distance range
The distance range over wh ich a flash can effectively provide light. Flash shooting
distance range is controlled by the amount of flash output available. Each
automatic Speed light's flash output varies from maxi mum duration to minimum
duration . Close-up subjects will require lower (to minimum) output, while more
distant subjects will require more light up to the maximum output.
The flash shooting distance range varies with the aperture, film speed , etc.
Flash synchronization
Timing of the flash so it coincides with release of the camera's shutter. There are
two types of synchronization : Front-Curtain Sync, which fires the flash at the start
of the exposure, and Rear-Curtain Sync, which fires the flash at the end of the
exposure.
Flash sync speed
Shutter speed at which the entire film frame is exposed when the flash is fired in
flash shooting . The N65/ N65QD's flash sync speed is 1/90 sec. or slower.
Flexible Program
Flexible Program function temporarily shifts an automatically selected shutter
speed/aperture combination while maintaining correct exposure. That is, the
desired shutter speed or aperture can be selected in Auto-Multi Program.
f-number
The f-number represents the aperture value and is calculated from lens' focal
length divided by the effective aperture opening. The standard numbers for
calibration are 1, 1.4, 2, 2.8, 4, 5.6, 8, 11 , 16, 22, 32, etc.
The smallest f-number is called maximum aperture and the largest f-number is
called minimum aperture. Lenses with large maximum apertures (smaller f-
numbers) are 'fast' lenses that allow photographers to use faster shutter speeds in
dim light. Lenses with smaller maximum apertures (larger f-numbers) allow the use
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of lower shutter speeds for available light but are also lighter and smaller than
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faster lenses.
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