I currently have a Nikon 200-400 mm telephoto ( and a D-300 body) and am trying to decide if my next purchase should be the 500 mm f4 or whether I should upgrade to a pro body like the D3S. I am considering the D3s because of higher ISO and faster autofocus and full frame clarity but am concerned about losing the 1.5x magnification crop factor. My shooting habits are pretty general but i do spend most of my time lately anyway doing wildlife. Any help would be most appreciated :confused:







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