When it launched the SB-24 Speedlight, it allowed Nikon the claim of having the best flash on the market..  Thi is still a great flash, in perfect working order and an ideal solution as a slave unit.  Some of the impressive features included are:

Guide Number (ISO100):  42m (138ft) with a 50mm lens.

Zoom Range: 24mm, 28mm, 35mm, 50mm, 70mm, and 85mm.

Power Output: 1/1 – 1/16

Physical Specs:  Weight: 390g (13.7oz) without batteries.

Dimensions: (W x H x D): 80 x 131 x 100mm | 3.1 x 5.2 x 3.9 in.

Battery Flashes and Recycling Times:  Alkaline:  100/7 seconds   NiCd/NiMh:  40/5sec

For further information, email:  gwilymh@iinet.net.au