37
H4X
Light metering and exposure control
Two primary factors have to be considered when making exposure control choice,
namely, metering method and exposure method:
Metering method
determines in which manner the light measurement is made and
how much of the image is taken into account (
Centre Weighted
,
CentreSpot
and
Spot
).
Exposure method
involves the parameters and deciding factors about how the light
measurement is translated into aperture and shutter speeds. Here the choice is about
the camera controls and their effect on the result or suitability for the subject. Included
in this choice is the type of automation too (Manual for 100% user control, Aperture
priority, Program, etc for automated control).
Some methods and modes are much more suited to various situations and applications
than others, while some depend to a greater degree on personal preference and ways
of working. A discussion of the points to consider in this context is beyond the scope of
this manual.
Since the light measuring system is TTL, filter factors, lens extension/extension ring fac
tors, etc, are automatically taken into account for average purposes. However, some
combinations of methods and equipment can cause slight discrepancies for various
reasons and therefore for critical work you should make alternative captures to suit per
sonal preference.
N o t e
Exposures are displayed on the grip display to within 1, 1/2 and 1/3 EV tolerances (depen-
dent on setting). This means that ‘half-stops’ are shown in a form that can differ from more
traditional displays. For example, the position between f/ 8 and f/11 is displayed as f9.5 and
likewise the position between 1/30s and 1/60s is displayed as 45. Therefore a display show-
ing ‘f 9.5 45’ simply means ‘f/9.5 at 1/45 second’. The appearance of an ‘s’ after the shutter
speed signifies whole seconds so, for example, ‘32s’ on the display signifies an exposure
time of 32 seconds, not 1/30.
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