What exactly are "Long Exposure NR" and "High ISO NR"?

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joe6pack
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What exactly are "Long Exposure NR" and "High ISO NR"?
4 months ago

In my NEX-3N manual, it says

"Sets the noise reduction processing for long exposure shootings."

"Sets the noise reduction processing for high ISO sensitivity shootings."

Which is equivalent to saying "Cruise control is a controller for cruising".

What exactly do they do? My camera has the option of "On/Off" for former and "Normal" and "Low" for latter.

Does it affect RAW file? I found somewhere about Nikon camera which High ISO NR does a dark frame subtraction. And exposure is doubled because dark frame is obtained using the same amount of time for exposure. And it is hinted that the RAW file is affected.

I can't find anywhere what it does on NEX.

 joe6pack's gear list:joe6pack's gear list
Olympus XZ-1 Sony Alpha NEX-3N Corel Aftershot Pro IrfanView
Sony Alpha NEX-3N
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