Nikon D3X User Manual page 216

A
The WG-AS1 Water Guard
The optional WG-AS1 is a water guard that covers the base of SB-900 flash
units mounted on the D3X, increasing the SB-900's splash resistance by
protecting the accessory shoe contacts from rain and spray.
A
Modeling Illumination
CLS-compatible Speedlights such as the SB-900, SB-800, and SB-600 emit
a modeling flash when the camera depth-of-field preview button is
pressed. This feature can be used with Advanced Wireless Lighting to
preview the total lighting effect achieved with multiple flash units.
Modeling illumination can be turned off using Custom Setting e3
[Modeling flash] (pg. 327).
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