Often the question is 3100 or 5100, two old but excellent cameras. The D3100 is more convenient to control, the quality of the photo during the day is about the same, in the evening the D5100 will be cooler in color and noise. In general, the impression of the D3100 is good. Pros: A good camera in terms of photo quality, an excellent whale 18-55, although you understand this with experience)) sharp + macro, light, fast silent Autofocus Got cons: The resolution of the display is the only negative for me. It is very difficult to assess the quality of the image (My Opinion)