Instruction manual

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Special FunctionsSpecial Functions

Brightness difference function

Pressing the S/A/H button after a normal measurement, or after performing

an averaging calculation, fixes the current reading or calculated average as

a reference value for difference calculations. Thus, when the next reading

is made, the measurement value is displayed on the digital readout of the

meter in terms of its difference relative to the fixed reference value or

averaged reference value.

This function is useful for various photography or motion film situations. It

allows you to quickly check the brightness differences between one part of

a composition and another, (e.g. front and background), or to measure the

unevenness of illumination over a scene, by directly showing exposure

differences between the current reading and a reference exposure value

(previous measurement value or averaged reference value fixed using the

S/A/H button).

This function can also be used for directly measuring the lighting ratio of a

scene, by showing the exposure difference between the shadow and

highlight areas of a composition, for highly precise lighting designs.

● The brightness difference function can be used in AMBI mode and

CORD mode. Exposure differences cannot be displayed in NON CORD

mode, even if you take readings.

● Displayable range of exposure differences is ±9.9EV (0.1EV steps).

♦ When you press the S/A/H button, the aperture required for proper

exposure of the highlight area will be calculated, and the result will be

displayed on the digital readout and on the analog scale for FNo. If you

press the S/A/H button again, all values will be erased from the display.

● If there are any measurement values already stored in memory, the

meter will determine the exposure for the brightest area measured and

stored in memory. The meter can only make highlight exposure

calculations with measurements stored in memory. If there are no

measurements stored in memory, the meter determines the appropriate

exposure based on the latest measurement (displayed reading).

● If you take photographs according to the aperture given by the highlight

exposure calculation, the highlight areas will be accurately reproduced

on film as highlights.

In the above example, the highlight exposure for the brightest area

measured (aperture: F16+0.5) was determined.

Aperture for highlight exposure

Apertures for

measurements in memory

Aperture for highlight exposure

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