Just got off the phone with Quantum Instruments, makers of the Quantum Qflash. First, they are still in business after being bought out by Promark about four years ago. They are still making the T5d-R and Trio Qflashes. And there is a T6 on the drawing board! For those of you who are new to Quantum, you may have hear of their Turbo batteries and Qflashes. The Qflash is a 150 watt flash that must be used with the Quantum (like) battery. It needs a camera bracket and while it will fire with a PC cord, there are TTL adapters to fit most cameras. The big thing about the Qflash is the quality of light it produces. It's just beautiful. Second thing is that they work, and work, and work some more. They don't over heat and shut down, they just keep on going. The regular Turbo batteries would give you about 225 full power shots, and many more if set to auto flash or ratcheted down to 1/4 or 1/8 power or more. The newer Turbo 3 battery uses the new NiHM technology and will give you more than 1000 full power flashes. Quantum still makes several different batteries to work with different makes of electronic flashes. Of course all this comes at a price; Quantum equipment ain't cheap. Their Qflash T5r-D cost around $700, and the Turbo 3 is about $625. You will also need a Quantum cord (around $50) for your flash if you use their battery. Qflashes come with the cord attached. And there are a bunch of odds and ends to complement the system. But, once you buy it, It will work and pay for itself in due time. I know this sounds like a commercial, but Quantum is an American company that got it right the first time. You can buy a Qflash T2 off Ebay.com and it will still work like it did brand new! Quantum was also the first flash company to really get TTL flash right. Also its wireless radio control of remote flashes is hard to beat. There are knock off flashes that look like Quantum's and I won't put them down, cause I haven't used them. One bad thing though, the Quantum T2 series is out of production and with the new owners, Quantum is not servicing or upgrading these units. The T4's and T5's are being repaired and updated when shipped back to the factory. Quantum also will refurbish and recycle its batteries and other equipment. Most of the time we hear of an American company being sold and soon after that being shut down. Quantum's continued existence is a boon for all serious and professional photographers. Check out their website, www.qtm.com.