Nikon SB-900 - Manual (Page 15)

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Preparation
Tips on using the Speedlight
Take trial shots
Make trial shots before photographing important occasions like weddings
or graduations.
Have Nikon spot-check your Speedlight regularly
Nikon recommends that you have your Speedlight serviced by an authorized dealer
or service center at least once every two years.
Use your Speedlight with Nikon equipment
The Nikon Speedlight SB-900’s performance has been optimized for use with Nikon
brand cameras/accessories including lenses.
Camera/accessories made by other manufacturers may not meet Nikon’s criteria for
specifications, and nonconforming cameras/accessories could damage the SB-900’s
components. Nikon cannot guarantee the SB-900’s performance when used with
non-Nikon products.