few years ago, when I start introduce Topaz Denoise… I am amaze with the result… still remember I introduce to most of my friends and I think it clean up and maintain most the “usable” ISO image which mean it still subject to image with very acceptable ISO (maintain details and not that bad grain) Those day, I am accept up to ~ISO8000
But recently, Adobe introduce new Enhance – Denoise. I am now change my workflow again !!! yes .. I am dare to shoot anything ~ISO12800-16000. (I will update some image soon) lets have a look at original image (click the link)
ISO10000
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ISO8000