I decided to see if my D700 was suitable for IR photography. I used my old Nikon 18-70mm, which is a DX lens, as it had right size thread for my Hoya IR72 filter at 67mm.
I set the CWB using the PRE, by aiming at the "green green" grass. All the shots were exposed for 30 secs anything less didn't seem to cut it. I got mixed results with the D700. It is definitely less sensitive to IR than my D70.
It was quite a cloudy day and during the 30 secs exposures if any one of the many clouds moved and blocked out the sun the shot would be ruined.