Nikon P340 - Manual (Page 170)

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Built-in ND Filter
When the camera's built-in ND filter is used, the amount of light that
enters the camera can be reduced to about one-eighth (equivalent to
three steps lower in terms of the exposure value) while shooting. Use in
situations such as when overexposure results from the subject being too
bright.
C
Effects of the Built-in ND Filter
Using the filter may enable the shooting of subjects that are too bright without
overexposing the image. It can also be used in situations such as when you want to
slow down the shutter speed at a small aperture value.
For example, at a shutter speed of 1/2000 second with the correct exposure, if the
ND filter is used to reduce the light by three steps, the speed can be changed to
1/250 second without changing the aperture value.
Rotate the mode dial to A, B, C, D or i M d button M A, B, C, D or
i tab (A9) M Built-in ND filter
Option Description
Y
On Use the ND filter to reduce the light.
Z
Auto
In mode A (programmed auto), reduce the light
automatically with the ND filter according to the
brightness of the subject.
• In shooting modes
B, C and D, the ND filter
becomes Off even if this option is selected.
k
Off
(default setting)
The ND filter is not used.