http://www.nikonchat.com/nikon-flash-commander-mode/
Can I use a SB 600 flash remotely using a nikon d3000 digital SLR camera without a commander mode?
The former had Responder a good idea to SC-28/29 strings. These allow you to still use iTTL functions of the camera and flash, to get the flash off camera. It is also a of the cheapest options. If you do not mind spending more, you also have the option to buy a SU-800 commander flash or SB-900 flash. Both elements are capable of acting as commanders and other fire flashes remotely, and without strings. This also gives you the option to expand later if you wish, either as an SU-800 or SB-900 can fire simultaneously flashes. (You can place an unlimited number of flashes by up to 3 different groups, each with its own configuration). If you go with the cable SC-28/29 still limited to a single flash. While some triggers on eBay can be expensive, are also probably not going to be very reliable. Pocket Wizards are reliable and work very well, but are much more expensive, and if you decide to buy more flashes later, you'd have to buy a receiver for the flash CADA, very expensive. They have their uses however, that the Nikon CLS system can do, such as triggering through walls, around corners, or in sunlight. To most purposes, however, the Nikon CLS system works very well. The world-famous photographer Joe McNally often sings the praises of Nikon CLS. Thus, if you want to go cheap and does not believe he'll be buying more flashes in the future, or going with the SC-28 or 29 the umbilical cord. If you think you can expand, and do not mind spend more money, go with either the Commander SU-800 (about $ 250) or a flash SB-900 ($ 450-500). That's what I recommend.
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