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What mode were you in, P, A, M, S? This is fantastic for a grab shot. Congratulations.
Welcome Matt. I just posted on your thread about lenses and thought you might make an appearance here.
Shooting with MF lenses makes impossible shooting in P mode. Typically shooting is in Aperture Priority, the Manual Mode works well in low light situations in which you want to keep your shutter speed up. This is quite a different world from the one you've likely been exploring with your AF lenses. Although there is considerable variety in MF lenses, from wide to long primes and a fine assortment of zoom lenses, they all have aperture rings and unless they've been modified with chips, all required setting of aperture on the lens and not in the camera.
Check this thread out and when you buy your first MF Nikon lens, take a few shots with your new D600 and share something with us. You'll find that Lightroom finally recognizes the D600 with its latest update. It should all work seamlessly. Have fun and come on back. You're more than welcome...