This stuff street photography , landscapes , architecture subject matter rely lenses longer 135mm.Up ISO 400 images totally clean , ISO 800 1600 hint noise creeping results still fully usable.ISO 3200 borderline grittiness starts set darker areas ISO 6400 quite obvious.ISO 12500 gritty , even actual delineation edges still reasonably good.ISO 25000 loses plot becomes noisy , ISO 50000 loses contrast well , making last two settings usable emergency , perhaps special effects.ISO figure noise starts become visible : ISO1600 ISO figure noise overwhelms image : ISO12500 Interested ? Help support ePHOTOzine using links.Amazon UK Amazon US Nikon Z5 The Nikon Z5 solid introduction Nikon Z series kit lens solid performer well.ISO performance really pretty impressive .