"The answer from Nikon to my question re error message..."
When using my D7000 with my Sigma 70-200mm 2.8 zoom, I noticed that the control panel would flash "r1000" when I depressed the shutter release button 1/2 way. So, I asked Nikon about it and here is their answer: "The R XX that is appearing on the screen refers to the buffer capacity, it does not mean that the memory card is full. The “rXX” count displayed on the top LCD is an estimate of the number of frames that the camera’s buffer can record without writing any to the memory card. It’s only an estimate because the size of a compressed JPEG file varies due to camera settings and subject matter.
#1. "RE: The answer from Nikon to my question re error message..." In response to Reply # 0 Thu 16-Dec-10 04:00 PM by greenwing
If you'd asked here, we'd have given a similar answer, except perhaps for two things:
r1000 sounds very unlikely, as the camera's internal buffer is not likely to be able to store 1000 images
r1000 sounds impossible, because the display has only 2 digits.
When you half-press the shutter release, the number of shots which can be stored in the internal buffer is shown. This is the case with all (watch someone correct me) Nikon DSLRs and does not depend on the lens that's attached.
If you're really seeing r1000, maybe someone else can help.
#3. "RE: The answer from Nikon to my question re error message..." In response to Reply # 0 Thu 16-Dec-10 06:01 PM by briantilley
As has been pointed out, it's not possible to see an "r1000" display in the control panel. The buffer maximum is 100 shots, and the display (after the "r") has only two digits anyway. As Nikon Support suggested, it's not an error message.
Page 38 in the D7000 manual explains what this display means