#1. "RE: r17 in D5100" In response to Reply # 0 Sat 20-Aug-11 11:39 PM by blw
Your question is anything but obvious, but I will guess that you've got some kind of problem and you're seeing r17 in the finder. The rXX is NOT an error message, it's simply the number of frames remaining in the buffer. This applies to all Nikon DSLRs, from the D1 to the D3x, D5100 and D7000. The number you'll see will vary widely, because buffers are different size (some models can be upgraded), the shooting situation can vary widely, and the settings in effect can consume buffer space at different rates.
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Nikon told me to reset the camera, which I did, but the r17 message remains. It seems to be just a nuisance--the camera works, both for jpg and raw. So I don't understand whether this is a real problem or not.
That appears to be a standard information item used by all Nikon dSLRs to indicate the estimated number of images that can be placed in the processing buffer of the camera has to start processing the images. This is of value to people shooting continuous images.