Most Helpful Customer Reviews
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51 of 52 people found the following review helpful:
5.0 out of 5 stars
Thermal shutdown - fixed?, December 26, 2008
I have an SB900 and agree with all the positive comments posted in other reviews, however I want to challenge those who are posting stories about thermal shutdown to supply some additional information about what situations really cause the flash to shutdown.
I've been using my SB900 for several months now, and I've never experienced a problem with the unit shutting down, so I thought I'd try a simple test.
I installed a set of brand new lithium ion batteries in my SB900, set it to full power manual mode, and hit the flash button manually as soon as the ready light lit - that's about one full-power shot every 1 or 2 seconds. I did this until the batteries were drained (that is, until it got to be about 10 seconds between flashes - that's a few hundred full-power flashes in a row).
Never once did the thermal protection circuit kick in...in fact, the temperature display barely moved for the first 50-100 shots, and throughout the test, even when I could feel the batteries getting warm, it never went much above the 50% mark. My test was indoors at an ambient temperature of about 70 degrees.
I tried other settings - repeat flash, flash with my D3 firing at maximum continuous speed, etc. But I could never even come close to driving the flash to shutdown. So perhaps Nikon fixed the issue, I'm just plain lucky - or it has to do with the type of batteries or maybe other accessories used.
With this issue out of the way, I'm able to give the unit an unqualified 5 star rating as it's simply the most capable and easy to use unit I've ever owned.
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45 of 46 people found the following review helpful:
5.0 out of 5 stars
Lots of misinformation in other reviews of this flash, May 4, 2009
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 two 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.
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101 of 110 people found the following review helpful:
4.0 out of 5 stars
Thermal Shutdown is for the Birds!, October 29, 2008
Fellow Wedding Photographers! Please listen! The SB-900's thermal shutdown is a very serious problem for us. I received my SB-900 last Thursday and shot a wedding on Saturday. YES! The thermal shutdown Grinch got me! Even after I read the reviews complaining about the problem, I rationalized it by thinking, well I probably don't shoot as fast as they do. WRONG! It got me after just 6 full power exposures!
As background, I've used a SB-800 for a couple of years shooting fairly rapidly and never had a problem with overheating. I likely had overheating, but the SB-800 flash withstood the stress. Not so with the SB-900's thermal shutdown feature. Reluctantly, I'm turning "thermal shutdown" OFF in the setup menu. Why? Because I love the SB-900 otherwise! It's a wonderful step above the 800. But now I may risk warranty repair problems should something happen.
I hate being put into that position by Nikon! I've been loyal to the brand since 1964's Nikon F days. Hopefully Nikon will come up with a cure, especially since the 900 has the ability for it's software/parameters to be remotely updated.
In the meantime, wedding photographers, you're taking a big chance the unit will shut down just when important shots happen, unless you disable the thermal shutdown protection mode.
I'm still rating the SB-900 as 4 stars, since all else seems fantastic. ATTN: NIKON! Please fix this problem!
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