I am a professional fine art photographer, and due to increased physical limitations, i can no longer carry my D700 or even my d90 comfortably on my daily walks. I tried a Canon G12, but the quality of pictures were not close to what I need to sleep at night. So i need a lightweight all purpose backup camera to use daily or on longer hikes when physically i get tired easily . I am considering the D3100 with a Tamron 28-300 on it (i have used this lens in the past, and while it is nowhere near my Nikon 28-300 on my D700, it is a good, lightweight lens. I would love to hear from people that have the D3100 and their experiences before I make my decision. And if anyone has other great suggestions, I'd love to hear them!