At which shutter speeds does the Long Exposure Noise Reduction make sense to use?

by Nikita Sokolsky   Last Updated December 23, 2017 13:18 PM

There is Long Exposure Noise Reduction function on Canon cameras that supposedly reduces the noise during long exposures. However it's not clear to me at which exposure lengths is the function most effective when shooting in RAW? Is there a guideline from Canon or some sort of a test carried out by an external website?

I've tried using it for 30-second exposures and I couldn't tell the difference in the resulting RAW file.

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