Noise Reduction on a 1DnMk2

[Weggy]

Have noticed the above body has a noise reduction setting... should I have this on or off, ie is it any good?

[chrisiow]

I think this is only for long exposures, I leave mine on auto.

[Jayst]

You should notice your 400D has it as well. As said, I just leave it on auto and it kicks in for any exposure over a certain length. 1/2" or 1" :thinking:

[Weggy]

Cool. Thanks. Didnt notice an auto option, just that it's currently set to 'off'

[mij]

With long exposure noise reduction enabled, when the shutter closes the sensor is activated again for the same length of time to take a black frame (the shutter being closed so it is not exposed to any light). As this will still be affected by things like bleeding and hot pixels it effectively creates a map that can be then used to tidy up the original shot.

As it effectively doubles the time it takes to take a shot, a 30 second exposure takes 60 seconds, so you need to decide whether time or highest possible quality is most important to you.

Michael.