Show NR be on or off?

[duraace]

There's an option (D300) to turn on NR for long exposures and high ISO settings.  The latter has options for high, normal, or low.  I only shoot RAW, and I import my images into Lightroom for processing, where they also have NR correction.  Does NR apply to RAW files in the camera?  If so, is it a good idea to do it there and/or later in software?  Does it come down to composition choices?  Should high, normal, or low be used?  Stupid questions, but it's time I get these things straight.

[Jonathan Wienke]

If it's dark-frame subtraction NR, then enable it. The indicator will be that the camera makes a second exposure of equal length with the shutter closed, and subtracts it from from the first exposure. This eliminates hot pixels and other noise artifacts that crop in longer exposures (>1 second or so). Any other NR I'd leave off; you can do better with NR tools in PS than the relatively simplistic NR that can be done in-camera in any reasonable amount of time.

[duraace]

If it's dark-frame subtraction NR, then enable it. The indicator will be that the camera makes a second exposure of equal length with the shutter closed, and subtracts it from from the first exposure. This eliminates hot pixels and other noise artifacts that crop in longer exposures (>1 second or so). Any other NR I'd leave off; you can do better with NR tools in PS than the relatively simplistic NR that can be done in-camera in any reasonable amount of time.
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Thanks.  I have no idea if the Nikon D300 is "dark-frame substraction" or not.  I do know that if NR is on, it seems to take a long time before the image can be viewed.  Whether to use high ISO NR or not would depend on the qualities / capabilities of the particular camera (i.e. can't generalize ... or can you?)

[Lisa Nikodym]

One or both of my Nikon cameras (D70 & D200) have dark-frame subtraction just like Jonathan describes for long exposures, so that must be what your D300 has too.

Lisa

[Jonathan Wienke]

I do know that if NR is on, it seems to take a long time before the image can be viewed.

That's a strong indication that it is dark-frame subtraction. The image isn't displayed until after the second exposure is complete and subtracted from the "real" exposure. If you made a 10 second exposure, dark-frame subtraction will take an additional 10 seconds for the second exposure plus a small amount of additional time for the extra processing.

[duraace]

That's a strong indication that it is dark-frame subtraction. The image isn't displayed until after the second exposure is complete and subtracted from the "real" exposure. If you made a 10 second exposure, dark-frame subtraction will take an additional 10 seconds for the second exposure plus a small amount of additional time for the extra processing.
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I just googled the D300 and "dark frame subtraction" in enabled for 1/2 second or longer.  Sounds good, but you think anything else, like high ISO is better handled in software?  Maybe the D300 is particularly good at limiting high ISO noise at low or normal settings?

Never mind: Got all the answers at [a href=\"http://www.kenrockwell.com/tech/iso-comparisons/2007-11/index.htm]http://www.kenrockwell.com/tech/iso-compar...07-11/index.htm[/url]

High ISO NR on the Nikon shooting raw doesn't carry over into 3rd party software (Adobe, Aperture, etc.), except for Nikon's own Nikon NX software.  Generally applies to in camera corrections to jpegs.