Thu 10-May-12 05:02 AM | edited Thu 10-May-12 05:05 AM by Piet_Venter
I would assume that you have set your camera's NEF recording to 14 bit depth (shooting bank). Set this to 12-bit and check the frame rate again. I do not own a D300s but a D300; the relevant section in the D300 manual is headed "The NEF (RAW) Recording Menu: NEF (RAW) Bit Depth" and is found on p59. The D300s manual should be (about) the same.
Oops - I see the matter has been addressed in another similar post.