Samsung ER-GX20ZBBA/E1, ER-GX20ZBBC/E1 Distance and Aperture when Using the Built-in Flash, 104

Models: ER-GX20ZBBB/DE ER-GX20ZBBA/SE ER-GX20ZBBB/SP ER-GX20ZBBA/DE ER-GX20ZBBC/GB ER-GX20ZBBA/E1 ER-GX20ZBBB/E1 ER-GX20ZBBB/RU ER-GX20ZBBA/FR ER-GX20ZBBA/DK ER-GX20B01KFR ER-GX20ZBBA/RU ER-GX20ZBBC/DE ER-GX20B02KFR ER-GX20ZBBC/E1 ER-GX20ZBAB ER-GX20ZBBA/NL ER-GX20ZBBC/ES ER-GX20ZBBA/IT ER-GX20ZBBB/FR

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Using the Built-in Flash

Distance and Aperture when Using the Built-in Flash

A set criteria is necessary between the guide number, aperture and distance when shooting with the flash. Calculate and adjust the shooting conditions if flash is not sufficient.

Built-in flash guide number

Sensitivity

Built-in flash guide number

ISO 100

13

ISO 200

18.4

ISO 400

26

ISO 800

36.7

ISO 1600

52

Calculating Aperture Value from Shooting Distance

The following equation calculates the aperture value for shooting distances.

Aperture Value Used F = Guide number ÷ Shooting distance

Example)

When sensitivity is [ISO 200] and shooting distance is 6.1 m, aperture value is: F = 18.4 ÷ 6.1 = 3

If the resulting number (3, in the above example) is not available as a lens aperture, the smaller number that is closest (2.8, in the above example) is generally used.

Calculating Shooting Distance from Aperture Value

The following equation calculates the distance of the flash for aperture values.

Maximum flash distance L1 = Guide number ÷ Selected aperture

Minimum flash distance L2 = Maximum flash distance L1 ÷ 5*

*The value 5 used in the formula above is a fixed value which applies only when using the built-in flash alone.

Example)

When sensitivity is [ISO 200] and aperture value is F4

L1 = 18.4 ÷ 4 = approx. 4.6 (m)

L2 = 4.6 ÷ 5 = approx. 0.9 (m)

Therefore, the flash can be used in a range of about 0.9 m to 4.6 m. The flash cannot be used when the distance is less than 0.8 m. When the flash is used at closer than

0.8m, it causes vignetting in the picture corners, light is distributed unevenly and the picture may be over-exposed.

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Samsung ER-GX20ZBBA/E1 Distance and Aperture when Using the Built-in Flash, 104, Sensitivity Built-in flash guide number

ER-GX20ZBBB/DE, ER-GX20ZBBA/SE, ER-GX20ZBBB/SP, ER-GX20ZBBA/DE, ER-GX20ZBBC/GB specifications

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