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Message: <blockquote data-quote="TieuNgao" data-source="post: 501402" data-attributes="member: 6993">Bob Blaylock: Thanks for your comments.1. I think an FX lens works better on an FX body than on a DX body. Let's look at three Nikon prime lenses: 35, 50, and 85mm f/1.8G mounted on D7100 and D600. According to DxO Lab the overall scores are 23, 22, and 30 with D7100 and 32, 31, 40 with D600, respectively. That's a huge difference.I have an analogy for this: If I stand near a window (the lens) looking out to my garden, I'll see part of the garden between the edges of the window. If I cover half of my eyes (the sensor), I'll see smaller part of the garden thru half of the window. I consider it's a waste of money to build the bigger window but only to use half of it because I cover half of my eyes.2. I think camera, lenses, filters, flash, tripod, etc... are components of a system, and they should work together in such a way that there's no bottleneck. A chain is only as strong as its weakest link! In my case I wouldn't buy expensive (to me) FX lenses such as 16-35mm f/4, 24-70mm f/2.8, or 70-200mm f/4 to be used on my old D7000 because I believe that the D7000 can't utilize those lenses to their max potential, and the camera becomes the bottleneck of the system.3. I don't expect that everyone would agree with me, but it's good to have discussion like this, and again thanks for your comments.</blockquote>