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Flash
shooting
distance
range
The distance range over which a flash can effectively provide light. Flash shooting
distance range is contro
ll
ed by the amount
of
flash output available. Each automatic
Speed light's flash output varies from maximum 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
sy
nc
speed
Shutter speed at which the entire film frame is exposed when the flash is fired
in
fl
ash
shooting. The N55'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
se
lected
in
Auto-Multi Program.
f-
numb
er
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
wi
th large maximum apertures (smaller f-numb
ers)
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 of lower shutter speeds for
available light but are also lighter and smaller than faster lenses. With some zoom
lenses, aperture varies depending on the focal length setting.
Focal
length
The distance from the principal point to the focal point. In 35mm-format cameras, lenses
with a focal
le
ngth
of
approx.
50
mm are called normal or standard
le
nses. Lenses with a
focal length less than approx. 35mm are called wideangle lenses, and lenses with a focal
length more than approx. 85mm are called telephoto lenses. Lenses which allow the user
to
continuously vary the focal length without changing focus are called zoom lenses.
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