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There are many differences. The most evident being: 14.2mp vs 6mp CMOS vs CCD ISO of 100 to 12800 (with boost) vs 200 to 3200 (with boost) Live View vs No Live View. ...and more.
Sorry, there was a problem. Please try again later.In a few ways: The D3100 is 14.2MP while the D40 is 6.1MP The D3100 newer technology (about 9 years worth). The D3100 has a 3 inch view screen while the D40 has only a 2.5 inch.
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