Optional Flash Units (Speedlights)
The 090 can be used with CLS-compatible flash units. Remove the
accessory shoe cover when attaching optional flash units. The built-
in flash will not fire when an optional flash unit is attached.
The Nikon Creative lightinmstem (ClS}
Nikon's advanced Creative Lighting System (CLS) offers improved communication
between the camera and compatible flash units for improved flash photography.
The Creative Lighting System supports the following features:
• i-TTL flash control: Improved through-the-Iens (TTL) flash control for use with CLS
(see page 265). Flash level is set using monitor pre-flashes to measure the light
reflected by the subject, ensuring optimal flash output.
• Advanced Wireless Lighting: Allows i-TTL flash control with remote wireless flash units.
• FV lock (pg. , 98): Locks flash level at the metered value, allowing a series of
photographs to be taken at the same flash level.
• Auto FP High-Speed Sync (pg. , 95): Allows the flash to be used at the highest shutter
speed supported by the camera, making it possible to choose the maximum
aperture for reduced depth of field.
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