Summary: The Nikon D3100 can use older Nikkor E Series lenses, but its light meter does not work with those lenses -- you need to determine correct exposure (F-stop and shutter speed) independent of the camera. This is a major gripe with me as it means the D3100 is not fully backward compatible with the many Nikkor lenses I already own. Using those lenses, the D3100 is more manual than my older manual cameras.
Summary: This is a Great Camera, the body is solid, all the buttons is perfectly position. Take great pictures, came out really clear. The Battery lasted a long time on one charge...just shooting with Auto mode right now and it perform just fine.
Summary: There are plenty of reviews here referring to this wonderful camera, and I share the feeling it's a great entry point for people that want to us DSLR cameras. So I won't bother being redundant about the good stuff. The only one thing that I'm disappointed is the connector cover (the one that protects the ports like USB, accessory terminal, etc) I bought a GPS accessory, and it's connected to the camera at all times.
Summary: I've returned to photography after a 25 year hiatus. I came back not to do professional work, as before, but to have fun shooting images. I've worked as a pro shooting film in several aspects of the field but burned out. Now, in the digital age, I've found the 3100 has a boat load of features that the novice and pro can take advantage of. If you need 'point and shoot' convenience or wanting to learn the art or need a reliable work horse then the D3100 can fill the bill.
Summary: My first DSLR. I went online to read the reviews.PROS: The Nikon D3100 came out the winner in its class & cost less then the Canon T3. Its easy to use and more camera then I will ever need.CONS:Not as many lens available as with Canon.For my self its the camera for me. Then I went to shop online Walmart Had the best price. I ordered it online picked it up the next day at my local Walmart. I love the pictures the Best I ever took Film or Digital.