Vello Flash Multiplier Adapter for Nikon SB-900 Series

The Flash Multiplier Adapter for Nikon SB-900 Series from Vello has a Fresnel lens that allows this flash head's output to be increased by up to three stops for long throw work such as nature photography. Alternatively, you can remove the Fresnel and replace it with the included diffuser to use the Flash Multiplier as a softbox.