ISO and noise
The crops shown below are taken from the area outlined above in red
Users of the Z 5 can expect lovely clean, noise-free images between ISO 100 and ISO 800 shooting in raw. Push to ISO 1600 and ISO 3200 and you’ll start to notice noise appearing, however it can be remedied by applying a small amount of noise reduction during post processing. ISO 6400 and ISO 12,800 are usable, but you’ll notice fine detail starts to be encumbered by increased noise in the latter. While I’d be prepared to shoot up to ISO 25,600 at a push on the Z 6, I’d consider ISO 12,800 to be the upper limit I’d be willing to shoot at on the Z 5. I’d highly recommend avoiding ISO 51,200 and ISO 102,400 at all costs.