NikonSB-900 AF Speedlight Flash for Nikon Digital SLR Cameras

This review represents an update after nearly 3 years of heavy usage. See below for the update.-------------For all those of you, who are reading these reviews, and can't quite figure out why Nikon would make such a "deficient" product, as this SB-900, this review should forever put the debate to rest.It has been suggested that the SB-900 is a sub-standard unit, because it will "overheat" at times, causing it to shut down, until it finally cools off, allowing it to eventually resume operations. There are some reviewers on this site, that will lead you to believe that this "safety" feature is an engineering flaw and thus, all would-be buyers need to beware, and seriously look elsewhere.I recently purchased this flash and used it heavily during a conference this past weekend, in which I was one of two event photographers. Admittedly, I was a little cautious and reserved when I purchased this unit, secondary to several negative reviews regarding it's habitual "overheating malfunction".Reflecting on it's performance this past weekend, I am pleased to report that It was used heavily in all situations and it never "malfunctioned" - not even once. Obviously, there were a couple of times when I was too far from the subject, causing the unit to discharge at full power. But, as an observant user, I recognized that this was my clue that I (not it) was doing something wrong. Thus with minor and reasonable modifications, a good outcome was reliably achieved.Interestingly, the owners manual does state that if the unit is used too heavily, it can get hot and shut down temporarily, as a precautionary measure. But it must also be noted that the owners manual for both the built-in camera flash and the SB-800 say the very same thing! In other words, if ANY flash is abused, misused or in any way used in a manner that is inconsistent with its designed purpose, it will overheat and shut down.This is NOT a design error on the part of Nikon. The overheating will only occur if the flash is fully discharged upon multiple consecutive occurrences, on a subject that is too distant for the flash to appropriately illuminate. If the flash is found to shut down, it is a sign that one must move closer to the subject or add more flash units. Again, overheating and shutdown is NOT a design flaw, it more appropriately represents operator error.Additionally, the new design is truly welcomed! The controls are MUCH better placed and much easier to use. It recharges much faster and works very smoothly. I am very pleased with Nikon's new design and any logical user will feel the same. You will not go wrong with this unit and undoubtedly, will find it a pleasure to work with on a regular basis.In summary: Do not be mislead by those users who are using the unit inappropriately. If you have never caused your built-in camera flash or SB-800 units to meltdown or "freez-up" (pun intended), You will likely not experience any such event on the SB-900. It is a very well designed unit, is much easier to use, and functions much more smoothly than any flash Nikon has put out thus far.Enjoy!-----------------------Review Update 2.5 years later after MANY additional events.OK, now after having the flash for a total of nearly three years, using it under all circumstances, including weddings, & conferences, I can again conclude that the flash is a very welcomed update. It has NEVER shut down, although once, under unusually heavy usage, the temp did get unusually high and I was aware that it certainly could, but never did.The only conclusion that I can arrive at, is:1. My unit is fault-free and others are flawed???2. I am among the those not abusing the unit???3. I have realistic expectations and some others do not???Again, years later, after MANY heavy events, I have NO regrets whatsoever!Also, if the unit was such a lemon, why is a 3 year old unit, selling for MORE than it originally sold for new, on eBay???I would love to buy another unit, but I have a hard time paying MORE for a 3 year old unit then I paid for mine NEW, years ago!For all would-be-buyers, carefully take everything into account. The unit is truly a serious design upgrade from the SB-800. It works much better and again, I own BOTH units and only use my SB-900, for many good reasons.After years of usage, I can only highly recommend it and would dearly like to get an additional unit for similar events.------------------If you found this review to be useful, please place your vote, so others can benefit as well.Thanks!

I can't believe the amount of misinformation presented in customer reviews for this product.First of all, it is true -- Nikon added a thermal cut-off that allows the customer to be absolutely certain that the flash never overheats. If that sensor is turned on, the flash can't shoot fast enough or often enough for professional usage -- particularly for weddings. Try shooting the bridal party introductions at a reception, for example. Even if you limit yourself to two flash pops per couple, by the time the third couple is walking in the door, the thermal shutdown will kick in, and you'll be swearing at the thing.However, you can simply turn the sensor off. In my experience, the flash is no more delicate than previous Nikon and Canon speedlights. Every Nikon and Canon flash has a duty cycle carefully described in their manual that virtually all professionals ignore and exceed, and yet -- most of us get years of usage from the flashes with no problem. I can't tell you the number of times I've taken batteries out of my flashes that were simply too hot to hold, and the flash housing was burning hot too -- but the thing just kept on working. So I think, if you turn off the thermal cut-off, the SB-900 will behave just like earlier flashes like the SB-800, in terms of overheating.So the simple answer is. . . if you turn off the thermal sensor, the SB-900 is at least as useful as a professional tool as it's predecessors -- no more, no less susceptible to overheating. I don't know why Nikon and Canon are so conservative in the duty-cycle ratings of their flashes, but I've talked with dozens of fellow pros over the years -- we all abuse the flashes, and we rarely have issues. I'm not saying that it's not possible to abuse these speedlights to the point where they will die -- I'm just saying I have used them professionally and repeatedly put hundreds of very fast, high-power pops on them, significantly exceeding the rated duty cycle, and have yet to kill a Canon or Nikon speedlight.As far as batteries go, Nikon fully supports and recommends the use of NiMH batteries -- both normal and Eneloops. The chart in the manual shows NiMH as being the best combination for a good number of pops and the shortest recycling time. Only the expensive Lithium non-rechargeables have better battery life, but they have a recycle time almost double NiMH. Alkalines give the smallest number of pops, and have the second longest recycle time.So fear not -- the SB-900 is the nicest speedlight I've owned yet -- I have three of them, and I like it far better than it's predecessors. Turn off the thermal sensor as soon as you take the flash out of the box, load it up with Eneloop batteries, and you will experience flash nirvana.Finally, I highly recommend the SD-9 accessory battery pack. Load it up with Sanyo Eneloops, and you can easily shoot an entire wedding (actually, probably two weddings) without swapping batteries, while enjoying the fastest recycle time possible with this flash.Update after using three of the SB-900s for a full wedding season: We encountered some flakiness (random flashing of the flashtube and AF assist lights) which I THINK is related to a loose fit of the SB-900's hot shoe base in the D700 camera's hot shoe. So far, it seems like applying Deoxit contact cleaner to both the camera and flash camera contacts makes the problem go away.