Nikon D3100 uses newer 14 MP sensor, up to ISO 12800 from 10 MP and 3200. This makes D3100 better in low light up to 2 stops. D1000 also has live view and full HD video recording capability. This will make D3100 as the first Nikon DSLR that able to record Full HD video. Nikon D3100 will also got the new processor which will boost up processing speed, auto focus in live view, and continuous focus in live view AF-F mode.
D3100 has new dedicated live view switch and button to activate live view mode for still or video recording. It also has new lever to change drive mode (single shot, continuous shooting, self timer and quiet mode).
However, D3100 will still have D3000 body. D3100 still does not have dedicated buttons to access popular setting such as ISO and White Balance, and does not have built-in auto focus motor to focus older Nikon AF lenses. D3100 also the same LCD as D3000 which is very unfortunate, because 230k resolution is quite low for either live view or video recording. Manual focusing will be a bit painful.
Overall, I think Nikon D3100 is a nice evolution of Nikon beginner DSLR camera, and will compete with other beginner camera such as Canon T2i. D3100 is suitable for beginners because it is use and learn plus it delivers high quality images. It is also good for more experienced photographer who are looking for lightweight camera that able to shoot still and record full HD videos.
|Nikon D3100||Nikon D3000|
|Image||14 MP / APS-C Sensor||10 MP / APS-C Sensor|
|LCD||3 inch 230k resolution||3 inch 230k resolution|
|Auto Focus||11 point system||11 point system|
|ISO||up to 12800, good up to 3200||up to 3200, good up to 1600|
|Movie recording||Full HD Video (1920 x 1080)||None, No Live View mode|
|Processor||New EXPEED 2||EXPEED|
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