Automatic High-Speed Synchronisation (Fp Or Hss); Preflash Function For Red-Eye Reduction - Metz MECABLITZ 50 AF-1 digital Nikon Bedienungsanleitung

11.5 Automatic high-speed synchronisation (FP or HSS)

Various cameras from Group E (D80, D2Hs and D200, for example) support auto-
matic FP high-speed synchronisation (see the camera's operating instructions). This
flash mode makes it possible to use a flash unit even with shutter speeds that are
faster than the flash sync speed. Interesting results may by achieved in this mode
when, for example, a wide open aperture (e.g., f/2.0) is used to limit the depth of
field in portrait shots taken in very bright ambient light. The flash unit supports
high-speed synchronisation in i-TTL, i-TTL and M flash modes.
For physical reasons, however, high-speed synchronisation significantly reduces
the number and the maximum flash range. Be sure to note, therefore, the flash
range on the display of the flash unit. High-speed synchronisation is activated
automatically if a shutter speed faster than the flash sync speed is set on the
camera, whether manually or automatically by the exposure program.
? Note that in the case of high speed synchronisation the guide number of the
flash unit also depends on the shutter speed. The faster the shutter speed, the
lower the guide number! The setting for automatic high-speed synchronisation
occurs on the camera (see camera operating instructions)! The display of the
flash unit then in addition shows „HSS".
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11.6 Preflash function for red-eye reduction

The red-eye effect occurs when the person being photographed is looking for
more or less straight into the camera, the ambient lighting is poor, and the flash
unit is mounted close to the camera. The flash unit then illuminates the interior of
the subject's eyes through the pupils.
Some camera models have a preflash function for reducing the red-eye effect.
One or more preflashes induce the pupils to contract more, thereby reducing the
red-eye effect.
On some cameras, the preflash function supports only the camera's inter-
nal flash unit or an illuminator incorporated in the camera body.
The preflash function is set on the camera (see the camera's operating
instructions)! Second curtain synchronisation (REAR) is not possible when
the preflash function is used. There is no setting or display for this mode
on the flash unit.