Sequence viewing > Photographic Exposure - Resource - © Lloyd Godman

Making Neutral Density Filters to understand Exposure

120 transparency film ( slide film that produces positive images) can be used to make a set of ND filters. Expose the film so that the exposure of each frame is one stop darker. Take a light meter reading and position Zone V ( mid grey) on frame 6

 

Units of light
2048
1024
512
256
128
64
32
16
8
4
2
1
Zone
0
I
II
III
IV
V
VI
VII
VII
IX
X
XI
Frame Number
1
2
3
4
5
6
7
8
9
10
11
12
Aperture
f1.4
f2
f2.8
f4
f5.6
f8
f11
f16
f22
f32
f45
f64

Sheets of smoked glass can also be used as a means of extending exposure times.

 

 

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