RICOH LENS A16 24-85 mm : Details on the setting for flash timing (Flash Synchro Settings).

You can select [1st Curtain] or [2nd Curtain] as the flash synchronization setting.

A flash will light during a very short moment. If a shutter speed is slower, the subject will be exposed even after the flash light ends. Moreover, in a case of moving subject, the captured image will differ depending on the flash timing. It is in [Flash Synchro Settings] that you can choose the flash timing.
[1st Curtain] fires the flash at the beginning of the exposure. [2nd Curtain] fires the flash just before the end of the exposure. [1st Curtain] is a convenient and commonly used setting that fires the flash when the shutter release button is pressed. However, [2nd Curtain] is useful for shooting moving subjects in slow synchronization, because it allows you to shoot more natural trails of light.

[1st Curtain] examples

• • Shooting with [1st Curtain] selected (car moving from left to right).
  The traces of the subject will be captured with forward lines.
• 

[2nd Curtain] examples

• • Shooting with [2nd Curtain] selected (car moving from left to right).
  The traces of the subject will be captured with backward lines.
• 

The flash synchronization settings are available in the [Flash Synchro Settings] in the Shooting menu.

See the FAQ below for the Shooting menu operations.
[Details on the Shooting menu operations.]

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