FILESIZE WARNING
>>2701473yer
i have no qualms about letting my camera automatically select ISO6400 in broad daylight
But then I reduce my images and don't give a fuck about grain at that level anyway.
When I was paying attention on my K5 I found ISO 16000 to be quite tolerable too, but whitebalance tends to go a bit weird sometimes. I'm pretty sure the K3 I use mostly now would be tolerable up at 16000 too, but I haven't needed to use it like that much, and the one time I did I opted for just setting ISO 512000... also fine considering what I was dealing with.