Quote Originally Posted by jks_photo
Just want to know what's the highest usable ISO speed on a 5d mkii??

Depends a lot on the white balance and other post processing. High key shot in magenta light with good post processing (not counting median-filter based noise reduction)? ISO 12,800 will look noiseless. High dynamic range low key shot in red light with subpar post processing? ISO 400 can look very terrible.


Generally most people will find ISO 3200 to be acceptable in most circumstances.