Olympus 260116 ユーザーズマニュアル

MANUAL

In this mode, the flash is emitted according to the guide number (GN)
setting.

Flash intensity ratio

Guide number

The control panel shows the current

guide number together with the flash
intensity ratio.

Flash intensity ratio: Ratio of emitted flash

intensity with respect to the intensity at full
emission.

Press the ZOOM button to adjust the

firing angle according to the focal
distance of the lens.

Turn dial A or dial B to set the guide

number.

How to determine the aperture value and guide number

When the shooting distance and aperture value are already
determined:

Determine the guide number with the following formula and set the value on
the electronic flash.

Guide number (GN) =

Aperture value (F) × Shooting distance (m)

ISO sensitivity coefficients

When it is necessary to determine the aperture value:

Determine the aperture value with the following formula and set the value on
the electronic flash.

Aperture value (F) =

Guide number (GN) × ISO sensitivity coefficient

Shooting distance (m)

When it is necessary to determine the optimum shooting distance:

Optimum shooting distance (m) =

Guide number (GN) × ISO sensitivity coefficient

Aperture value (F)

ISO sensitivity and their coefficients

ISO sensitivity

100

200

400

800

1600

3200

Coefficient

0.5

0.71

1.0

1.4

2.0

2.8

4.0

5.6

For details about the guide number, refer to “Guide number (GN) list” (

gP. 45).

ZOOM button

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2007/08/01 14:44:01