What is it with camera manufacturers, and indeed camera buyers, with the big ISO thing?
I see Nikon announce their latest pro camera today with maximum ISO of 409,600... and I know instinctively it'll be all but unusable at that setting. My own camera (this time a canon, they all play this silly game) boasts 100,000 + on the same scale, and it's utterly horrible if I try it. Being proportional, every camera I've ever noted has at least two high ISO settings which are so dreadful as to be laughable, but still manufacturers embarrass themselves by adding them, and we as consumers seem unbothered that these options are like an ashtray on a motorbike.
I love high ISO, being a fan of the dark, but wouldn't it be more realistic for cameras to come equipped with just the usable range built in? In fact, given that ISO is by definition as standardised range, wouldn't it be possible to gauge acceptable noise at a given light level and use this as a guide in promoting a camera. Parts per million noise or similar?