How long an exposure before engaging LENR?

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sdb123

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Quick question (particularly those with a Nikon D700/D3)....how long an exposure is safe (or recommended) before you need to engage Long Exposure Noise Reduction?

Btw, I've upgraded the firmware on my camera to the latest version, as there was a known issue with LENR.

Thanks,

Steve
 
LRNR will only engage after a certain length of shutter speed (your manual will tell you)
 
Why do cameras have an option to enable it or not.
What's wrong with having it always enabled.
 
I have always had mine enabled on my Canon and it has not caused any issues that I can tell! I guess to test it you need to take lots of shots and compare with and without! They would have to be exactly the same though to get a good idea...
 
arclight said:
Why do cameras have an option to enable it or not.
What's wrong with having it always enabled.
Click to expand...

Because it can take ruddy ages to view your shot after a long exposure with noise reduction on, some can take the same time as the exposure again before you can view. A real nightmare for lightning shots when you want to crack on & get the shutter open again.
 
good bye reciprocity failure...thank goodness
 
I may be wrong in thinking this but also if you are shooting in RAW then why have the camera spend extra time processing the JPEG if you are going to be using the RAW anyway.

As I say, I may be wrong in thinking that the noise reduction in not executed on the RAW and just the JPEG
 
rotherad said:
I may be wrong in thinking this but also if you are shooting in RAW then why have the camera spend extra time processing the JPEG if you are going to be using the RAW anyway.

As I say, I may be wrong in thinking that the noise reduction in not executed on the RAW and just the JPEG
Click to expand...

I'd like to know the answer to that. If RAW is unaffected by NR (logic says it should be because RAW is unprocessed) then NR can be permanently turned off by those that only shoot RAW.
 
It is my understanding that the RAW file will not get any NR only Jpeg's are put through the NR filter. a simple test tonight will confirm this, just shoot the sky and see the noise in the RAW and the noise in a Jpeg, then do the same with the NR turned on. The random noise should be gone in the Jpeg.

The other factor in the noise reduction is the points at which the D3 will start to use the NR function. Page 299 on the instructions outlines the ISO's which will be effected / not affected by the NR filtering.
 
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