Nikon SB-900 AF Speedlight Flash for Nikon Digital SLR Cameras Review

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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Product Description:
Professional i-TTL Speedlight compatible with Nikon FX and DX format SLRs, and part of the Nikon Creative Lighting System. This powerful Speedlight offers photographers extensive creative opportunities for their flash photography. Three illumination patterns - Center-weighted, Even and Standard - provide total control over flash coverage and it covers a class-leading auto zoom range of 17-200mm in just 1.2 seconds.Advanced features include a booster circuit that enables high-speed recycling using four AA-type batteries and a built-in thermal protection system to warn of excessive heat build up. The SB-900 can automatically detect the presence of a fluorescent or incandescent color filter and transmit this information to the attached camera's white balance setting, and its firmware can be upgraded via the camera body.

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