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Physically very similar to its predecessor the D3000, the D3100 is built around a 14.2 megapixel CMOS sensor, bringing not only live view but also Full HD video capture to Nikon's entry-level model. Compared to the D3000 the body gets a slight refresh, gaining an extra button to the left of the screen, a drive mode switch at the base of the mode dial, a sprung lever to engage live view and a direct record movie button. The D3100 has a new 11-point AF system, and Nikon has also added an additional AF-F autofocus mode to allow better focusing in live view and autofocus during video shooting.
The D3100 offers little to complain about in terms of image quality, and its new 14Mp sensor delivers very good results. High ISO performance is substantially improved over the D3000, to the extent that images shot at sensitivities as high as 3200 are eminently usable. There's no doubt that the D3100 is one of the best entry-level SLRs available, offering very good image quality coupled with speedy operation and straightforward handling.
| Body type | Compact SLR |
| Max resolution | 4608 x 3072 |
| Effective pixels | 14.2 megapixels |
| Sensor size | APS-C (23.1 x 15.4 mm) |
| Sensor type | CMOS |
| ISO | Auto, 100, 200, 400, 800, 1600, 3200 (12800 with boost) |
| Lens mount | Nikon F mount |
| Focal length mult. | 1.5× |
| Articulated LCD | Fixed |
| Screen size | 3″ |
| Screen dots | 230,000 |
| Min shutter speed | 30 sec |
| Max shutter speed | 1/4000 sec |
| Format |
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| Storage types | SD/SDHC/SDXC |
| USB | USB 2.0 (480 Mbit/sec) |
| Weight (inc. batteries) | 505 g (1.11 lb / 17.81 oz) |
| Dimensions | 124 x 96 x 75 mm (4.88 x 3.78 x 2.95″) |
| GPS | Optional |
With the addition of video and live view, Nikon has given its entry-level DSLR all the features its predecessor seemed to be missing. The result is an excellent beginners camera that encourages the user to grow into it whatever their existing level of knowledge. However, it's not alone in offering this and, though it's a great DSLR, there are plenty of equally attractive mirrorless alternatives.
Good for: First time DSLR users who want a camera that will encourage them to make the most of its capabilities.
Not so good for: People wanting a camera that behaves just like their existing compact. Users for whom compactness is a priority.
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