Nikon on Thursday launched an update to its highest-end crop-frame DSLR. The D300s practically replaces the regular D300 and adds 720p, 24FPS video recording inherited from the D90 but with several improvements: it can now autofocus while shooting movies, change the color and tone of videos, and attach an external microphone. The autofocusing system is now faster than the D300 and, because it tr
