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Message: <blockquote data-quote="aroy" data-source="post: 325499" data-attributes="member: 16090">Not many cameras have low noise at ISO 6400. High ISO in my opinion is for those situations where nothing else will work. For normal lower end bodies, ISO 800 is about the limit for clean images (in my D3300 it is ISO 200, beyond that you can see the noise).Most of the camera bodies also struggle with AF on "slow" lenses, and beyond a point will not AF. That is one of the reasons for having a fast super telephoto; like 300mm F2.8 and 400mm F2.8; they acquire and track autofocus very fast. So you buy them even though most of your shots will be at F4 or more.Of course if you shoot predominantly in low light, fast action and require a lot of DOF, then High ISO is your only recourse, and you can use slow lenses.</blockquote>