Canon ZOOM 8-3 - Manual (Page 28)

FILTER GUIDE
Film Sensitivity
12 16 6 6 4 3 2 ISl.
Equivalent to ASA 32
Equlvol^nf to ASA 100
Equivalent to ASA 250
CHART OF EXPOSURE FACTORS
OF CANON FILTERS
Type oF FiUer
$L
39.3C
SY SY
44.2C ! 50.2C
SO SR
56.2C 1 60.2C
MG
55.C
Exposure Factor 1.5 1 2 3 Ó 3
Type of Filter
1 CC 1 CC 1 c, ,, 1
A
1
B Skylight
ND
4
ND
8
Exposure Factor 1 2 1 3 [ 1 4 6
FILTER GUIDE
When using various Color Conversion and Neutral Density fND)
Filters, the exposure meter odiusting dial should be set to a figure
which is lower thon the actual film sensitivity of the film to be used.
The degree to which this figure is to be lowered should be equivalent
to the exposure factor of the filter.
HOW TO READ THE CHART
When using ASA 250 film !n conjunction with on ND4 filter, extend
sensitivity point 250 horizontolly to the right, os shown in the exam­
ple. When it hits exposure factor line 1 move upwords until the verti-
co! line hits exposure factor line 4. Then move horiiontoily to the left
ond read the ASA sensitivity.
In this cose, the ASA sensitivity reods 64 ond indicates the figure to
which the exposure meter odjusting dial should be set when using o
filter with an exposure factor of 4X.
In this some manner, when using filter Y3 the exposure meter odjusting
dial should be set ot the lowered figure of ASA 125.
By using the Filter Guide the sensitivity figure to which the exposure
meter odjusting dial should be set con easily be calculated.
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