It may look like a small studio strobe, but Quantum's Qflash is one of photography's most powerful, versatile portable lighting solutions. Its limitation has been a lack of wire less exposure control. The Qflash T5d makes amends. Hook it up to one of Quantum's hot-shoe TTL adapters and you can use the company's FreeXwire transmitters and receivers to control multiple T5d units with your brand-name SLR, digital or 35mm. You can even set lighting ratios remotely. Because the system uses radio signals it works through walls and at distancesof up to 500 feet. About $625.