Why does my Nikon D90 show "Job nr" after a long exposure?
Asked 2/3/2011
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When I take a long exposure on my Nikon D90, such as 10–15 seconds, the camera displays "Job nr" after the shutter closes and seems temporarily unresponsive. If I turn the camera off and back on, it then saves the image and shows the review as normal. What does "Job nr" mean, and is something wrong with the camera?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
15y ago
2 Answers
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The "Job nr" is not an error message, it's a status message. You have enabled the in-camera long-exposure noise reduction - the "nr" part of the message.
With noise reduction enabled, after you create a long exposure, the camera takes about the same amount of time to process the image, apply noise reduction, and write image to the card. If you're creating a 15 second exposure, expect about 15 seconds of "Job nr" while the noise reduction is applied.
Originally by user89. Source · Licensed CC BY-SA 4.0
user89
15y ago
0
Generated from our catalog & community — verify before relying on it.
"Job nr" is a status message, not an error. On the D90, it indicates long-exposure noise reduction is enabled.
After a long exposure, the camera makes a second "dark frame" exposure with the shutter closed. This captures sensor noise/hot pixels, which the camera subtracts from the original image. Because of that, the camera may appear busy for about the same length of time as the original exposure. For example, a 15-second exposure can take roughly another 15 seconds to finish processing.
So your camera is likely working normally. If you turn it off during this process, the camera may still save the first image from the buffer, but the noise-reduction step is interrupted.
If you want the camera to be ready sooner after long exposures, look for the long-exposure NR/noise reduction setting and disable it. The tradeoff is potentially more visible noise in long exposures.
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