Nikon announced the successor to their flagship SB-900 Speedlight yesterday. The main difference between the original model, introduced in mid-2008, and the new SB-910 is a re-engineering of the thermal protection circuitry.
Users of the SB-900 often complained that fast-paced shooting would result in the Speedlight shutting down completely until it cooled down to a safe temperature. The work-around, that I often saw used by my Nikonian friends, was to disable the thermal cut-out via a custom function.
With a nod to practicality, the Nikon engineers have reworked the thermal protection so that the SB-910 slows down the recycle time rather than disable the Speedlight entirely. Other improvements include an updated user interface that matches the UI on the SB-700 and new hard filters for shooting under tungsten and fluorescent light.
The SB-910 will ship in mid-December for a price in the mid-$500 range. You can pre-order it here on B&H.
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