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∫ About the Exposure
The difference between the nominal F value (aperture value displayed on the camera) and the effective F
value (actual aperture value) will be greater when taking pictures using the macro function, which allows
you to take pictures of close-up subjects enlarged. When using a commercially available stand-alone
exposure meter, it is necessary to correct the value depending on the magnification and distance from the
subject. Refer to following table for the exposure correction (exposure factor).
It is not necessary to correct the difference between the nominal F value and the effective F value with the
automatic exposure of the camera, since it will determine the exposure by measuring the light coming in
through the lens.
Guide for exposure correction when using a stand-alone exposure meter
Magnification
Distance
Nominal F value
Effective F value
Exposure correction
(Exposure factor)
(In steps of 1/3)
≥ Distance is the actual distance between the recording plane ([
camera) to the subject.
≥ Magnification represents the (size of the image of the subject at the recording plane) / (actual size of the subject).
1/¶
1/8
0.47 m
¶
(1.54 feet)
(0.92 feet)
F2.8
F3.2
1
+
n0
3
1/4
1/3
0.28 m
0.23 m
(0.75 feet)
F2.8
F3.5
F4.0
2
+
+1
3
] marked on the body of the digital
1/2
1/1.5
0.19 m
0.17 m
(0.62 feet)
(0.56 feet)
F4.5
F5.0
1
2
+1
+1
3
3
1/1
0.15 m
(0.5 feet)
F5.6
+2
11
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