GND, atau Graduated neutral density filters (graduated filters)
GND, or Graduated neutral
density filters (also
known as just graduated filters) are different from other filters in many ways,
one of which is that they are often rectangular rather than circular but the
functional difference is that part of the filter is a darker (neutral) colour
that fades into the clear sections. The transition from neutral colour to clear
can be either abrupt or gradual but the function is the same, reducing the
difference in brightness between the ground and the sky. Therefore they are
used mostly for landscape photography. GND filters also have numbers which
indicate how many stops of light they reduce the brightness by.
ND or neutral density
filters
ND or neutral density filters reduce light from all wavelengths passing
through the lens across the entire filter (there is no clear part of the
filter). They have three uses, firstly to reduce the brightness of light,
secondly to allow the use of a larger aperature and finally to allow the use of
a slower shutter speed. Although they are also useful for landscape photography
they are also handy for other outdoor photography.
B&W Filter
with & without ND FILTER
with & without ND FILTER
