[batema (Mark)]

I have just found out that my 400d has the noise reduction feature - god I'm slow - and my mate took Horse head 10 min with this feature not activated on his canon 1000d and then activated and the difference was amazing. If you are using this function do you then only stack the images once they have been taken or should you then also take some additional darks? My understanding (maybe wrong) is to increase the signal to noise ratio so if you stack 3 images with Noise reduction on does the signal become three and the noise become one nineth (inverse square law). Any advice much appreciated.

Thanks

Mark