Here is what is better in the Nikon D7000:
- The sensor is a little bit bigger, but it isn't much and the performance according to Dxomark is a great deal better in the Nikon D7000, so you will get a camera that will produce better images
- The Nikon D7000 has a second card slot, so you can store more images/videos without backing up to a computer or you can just make a backup as you take the image to the other memory card
- The viewfinder in the Nikon D7000 is bigger and you get to see 100% of the picture you take. This makes it more comfortable to take pictures
- The Nikon D7000 can use older non AF-S lenses with autofocus working, where in the Nikon D3100 you just get the right exposure and have to focus manually. Remember that you can find a lot of good bargains going for some of the older Nikon gems
- The Nikon D7000 can shoot at 1/8000 which is faster than the Nikon D3100 with 1/4000, but I doubt you ever will need this speed
- The Nikon D7000 can shoot at 6 frames per second which is the double of the Nikon D3100 with 3 frames per second. This is important if you shoot action or wildlife pictures as it just might be the picture frame that captures your subject perfectly
- The metering engine in the Nikon D7000 is better, so in dark or difficult light situations there is a higher chance of getting a picture that is exposed just right with the perfect amount of light to the picture
- It is possible to use exposure bracketing with the Nikon D7000, which is a great feature that often is used in hard light situations, so you shoot maybe 3 frames with different exposure and later you can choose the picture that you think have the right exposure.
- The ISO can be pushed to ISO 25600, which is one step higher than the Nikon D3100 and the performance at high ISO is also better
- The autofocus engine in the Nikon D7000 is a lot better than the one in the Nikon D3100, so it will be easier to get a sharp picture
Here is what is better in the Nikon D3100:
- The body is smaller and lighter, but the difference isn't that big
The Nikon D7000 is a great upgrade option from Nikon D3100. You get a lot of great features that will make it more fun to be a photographer and the images that you get out of the camera should be better and more sharp. If you haven't gotten any of the camera the price difference of $500 (February 2013) is a lot, so you have to consider if those extra features that you get in the Nikon D7000 is something you need or you can settle with the Nikon D3100.
- What to expect from the replacement of D7000 and D300?
- Nikon tele zoom lenses
- Canon macro lenses
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