• 14-bit NEF (RAW):uncompressed or compressed RAW. Images are recorded at a bit-depth of 14 bits, producing files roughly 1.3 times larger than 12-bit files but increasing the color data recorded resulting in smoother tones. Maximum frame advance rate decreases to 2.5 fps.
とあります。最後の部分ですが、2.5fpsに減少するとあります。
ただ、「Maximum number of continuous shots (JPEG Large-Fine or NEF/RAW)」には
• Up to 99 shots at 6 frames per sec with 14-bit processing (Jpeg) • Around 19 images at 6 or 8 fps in NEF/RAW with 12-bit processing
http://www.digitalreview.ca/content/Nikon-D300-Digital-SLR-Camera.shtml
ここの表の「Image Quality Settings」に
• 14-bit NEF (RAW):uncompressed or compressed RAW. Images are recorded at a bit-depth of 14 bits, producing files roughly 1.3 times larger than 12-bit files but increasing the color data recorded resulting in smoother tones. Maximum frame advance rate decreases to 2.5 fps.
とあります。最後の部分ですが、2.5fpsに減少するとあります。
ただ、「Maximum number of continuous shots (JPEG Large-Fine or NEF/RAW)」には
• Up to 99 shots at 6 frames per sec with 14-bit processing (Jpeg)
• Around 19 images at 6 or 8 fps in NEF/RAW with 12-bit processing
とあるので、
JPEGなら14bitで6fps*99枚いけるように読めます。
RAWの場合は、やはり12bitで6or8fpsで19枚前後とあるので、14bitで制限を受けるのはRAWが絡んだ場合なのかもしれません。