Nikon n65 - Manual (Page 105)

ISO film speed
The international standard for representing film sensitivity. The higher the number,
the greater the sensitivity, and vice versa. A film speed of ISO 200 is twice as
sensitive as ISO 100, and half that of ISO 400 film.
Rear-Curtain Sync
Flash fires an instant before the second (rear) curtain of the focal plane shutter
begins to move. When slow shutter speeds are used, this feature can create a blur
effect from the ambient light, i.e., flowing-light patterns following a moving subject
with subject movement frozen at the end of the light flow. (See “Front-Curtain
Sync”.)
Slow Sync
A flash technique for using the flash at a slow shutter speed. Flash shooting in dim
light or at night at a fast shutter speed often results in a flash-illuminated subject
against a dark background. Using a slower shutter speed with the flash brings out
the background details in the picture. Use of a slow shutter speed with Rear-
Curtain Sync is particularly effective for illustrating the movement of a stream of
light.
The N65/N65QD’s Slow Sync mode extends the automatically controlled shutter
speed range down to 30 sec. (in Auto-Multi Program, Aperture-Priority Auto) or 1
sec. (in S Night Scene mode).
Vignetting
Progressively diminished illumination on the film from the center to the corners.
There are two kinds of vignetting—natural vignetting caused by the lens, and
vignetting that is caused by improper use of accessories such as a lens hood or
filter.
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