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Message: <blockquote data-quote="BackdoorArts" data-source="post: 232312" data-attributes="member: 9240">I believe your issue may have to do with the Auto shutter speed and a longer lens.  I just tried testing this with my D600 and it seems that if you are in Aperture Priority mode the ISO will be set so that the camera shoots with a shutter speed faster than your focal length.  In other words, as I zoomed in an out at a constant aperture the ISO changed with the shutter speed in a way that maintained a shutter speed faster than the current focal length.So, if you've got a 300mm lens on the camera will set the ISO so that a shutter speed faster than 1/300s can be used. When using Auto ISO I always set the minimum speed manually based on the lens I am using.</blockquote>