The chart lists approximate guide numbers for manual flash calculations. The following equations are useful in determining the guide number, aperture (ƒn), or flash-to-subject distance required for expo- sure.

Guide no. (for distance in meters / feet)

 

Guide no. = distance

 

 

 

 

 

ManualCamera sensitivity (ISO)

 

ƒn.

flash

100

200

400

800

Guide no. = ƒn. X distance

Full (1/1)

8 / 26

11 / 36

16 / 52

22 / 72

 

1/4

4 / 13

5.6 / 18

8 / 26

11 / 36

Guide no.

1/16

2 / 6.6

2.8 / 9.2

4 / 13

5.6 / 18

distance = ƒn.

MAGNIFICATION BUTTON AND ELECTRONIC MAGNIFICATION

The magnification button can be used to activate the digital zoom (p. 46) or enlarge the center of the image by 4X to aid manual focusing. The function of the magnification button is selected in the advanced 1 section of the recording-mode menu (p. 80).

When electronic magnification is selected on the menu, the digital zoom is canceled. Electronic magnification can only be used during manual focus. The magnified display cannot be used to set the exposure.

Press the magnification button on the back of the camera. The magnifier icon is displayed on the monitors when electronic magnification is in effect.

Pressing the magnification button a second time cancels the function. When the shutter-release button is pressed partway down, the magnified display is canceled showing the entire image area.

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