Test high ISO performance
Set up in natural light
Set up your subject by a window. We shot a still life so we could take our time and picked a clear day so the source of natural light was constant. Secure your camera on a tripod so each composition is identical – it’s important to introduce as few variables as possible. The tripod will also allow you to shoot at the slow shutter speeds required when using low ISOS.
AF and exposure
Input your base ISO in Manual mode (this is the smallest value before Lo settings). Choose a suitable aperture – this will remain constant as you shoot. Then use autofocus to lock onto your subject and switch to manual focus to prevent hunting. We’d also recommend switching to self timer to prevent any camera shake.
Cycle your ISO settings
Take each shot in one-stop increments: ISO100, ISO200, ISO400, etc. You’ll need to increase your shutter speed to maintain the same exposure, so pay close attention to your camera’s light meter. You can work through your camera’s native ISO range (our D800’s is 100-6400), but may wish to test its Lo and Hi extended settings too.
Review your images
Transfer your images to a computer, and analyse the level of noise on each Raw file. Even at base ISO you’ll still find traces of noise when zoomed in. You now need to work out what level of noise is acceptable. Somebody who only posts small images on Instagram might be more forgiving than those who regularly create large prints.