[quote=robski]Depends on what camera you have Charly. On my Canon 300D 400 ISO was really the safe limit. Now on my 20D I don't like pushing it above 800 ISO.QUOTE]
I agree - with my Minolta A2 ISO 400 was really beyond the limit. Now I have a 20D I have used all the was up to ISO 3200 when its necessary to obtain a fast enough shutter speed to freeze the movement/eliminate camera shake - see
this shot in my galley taken at ISO 3200
I used to use Noise Ninja but now I shoot in RAW I do my noise reduction in Camera RAW at the time of the RAW conversion which IMHO gives as good results and is quicker - if you've not tried this have look at
this thread