Filter
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Accessories-Filters
Nikon filters are made of optical glass, ground and polished so that both surfaces are
optically flat and parallel.
Nikkor lenses and Nikon filters are made for each other. For best results, use Nikon
filters on Nikkor lenses. Nikon filters are available in both screw-in and series mounts,
depending on the type of lens.
Since filters cut down on the light passing through the lens, some increase in exposure
time or in lens opening is necessary to compensate for the loss of light. This increase is
expressed as a filter factor. For example, if the filter factor is 2, double the exposure time
or open up the lens one full stop. Filter factors depend on the light source and type of
film. The chart at right shows the filter factors.
No exposure compensation is necessary with the Photomic FTN finder. The built-in
meter reads only the light passing through the lens and therefore compensates
automatically for loss of light.
Type Designation
Esposure factor
Daylight
Tungsten
light
Black-and-white film
Yellow
Light
Medium
Deep
Y44
Y48
Y52
1.5
1.7
2
1
1.2
1.4
Orange O56 3.5 2
Red R60 6 5
Green
Light
Deep
X0
X1
2
5
1.7
3.5
Black-and-white and
color films
Ultraviolet
L37
L39
1
Polarizing Polar 2.4
Neutral Density
ND 4X
ND 8X
ND 100X
ND 400X
4
8
10
400
Color film
Skylight L1A 1
Amber
Light
Deep
A2
A12
1.2
2
Amber
Light
Medium
Deep
B2
B8
B12
1.2
1.6
2.2