209

Using the Trailing Curtain Sync

Trailing Curtain Sync discharges the flash immediately before the shutter closes. When shooting moving objects with a slow shutter speed, Trailing Curtain Sync and Slow-speed Sync produce different effects depending on when the flash is discharged.

For example, when shooting a moving car with Trailing Curtain Sync, trailing light is captured while the shutter is open and the flash captures the car immediately before the shutter is closed. Therefore, the picture will include a sharp, well-lit car with trailing light behind it.

Slow-speed Sync

(Leading Curtain Sync)

Trailing Curtain Sync

Trailing Curtain Sync slows down the shutter speed. Use the Shake Reduction function, or turn off the Shake Reduction function and use a tripod to avoid camera shake.

Distance and Aperture when Using the Built-in Flash

Relationships among the guide number, aperture and distance must be considered when shooting with the flash to obtain a correct exposure. Calculate and adjust the shooting conditions if the flash output is not sufficient.

Sensitivity

Built-in Flash

Sensitivity

Built-in Flash

Guide Number

Guide Number

 

 

ISO 100

Approx. 4.9

ISO 1600

Approx. 20

ISO 200

Approx. 7

ISO 3200

Approx. 28

ISO 400

Approx. 10

ISO 6400

Approx. 40

ISO 800

Approx. 14

 

 

10

Using the Flash

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Image 211
Pentax 12161, 12195 specifications Using the Trailing Curtain Sync, 209, Sensitivity Built-in Flash Guide Number, Approx ISO