Thanks for calling me a drive-by, dude. FWIW to you, I am a loyal Nikon user for 25 years, and I own all of their very best products. While I'm not a professional, I take about 7,000 photos a year as I travel around the world for work and pleasure. - I tried different lenses - I upgraded the firmware - I did a total reset - I discussed this with B&H technical support The 3 D600s I tried WILL NOT AUTOFOCUS by pressing the shutter button...PERIOD. It's not that complicated to explain. My lenses work perfectly on my D4, as well as the D700 and D300 I recently sold.