Nikon D3100 vs Sony A77

On this page, we are evaluating the Nikon D3100 vs Sony A77, former is a Entry-Level DSLR while the other is a Advanced DSLR by companies Nikon and Sony. There is a substantial difference among the image resolutions of the D3100 (14MP) and A77 (24MP) but both cameras posses the same sensor dimensions (APS-C).

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The D3100 was revealed 10 months prior to the A77 so they are of a similar age. Both cameras have different body design with the Nikon D3100 being a Compact SLR camera and the Sony A77 being a Mid-size SLR camera.

Before diving into a step-by-step comparison, here is a quick introduction of how the D3100 scores versus the A77 with regards to portability, imaging, features and an overall mark.

Following is a sample of the gallery pics for Nikon D3100 & Sony SLT-A77. The full galleries are available at Nikon D3100 Gallery & Sony A77 Gallery.

For those who are intending to travel with your camera, you will need to factor its weight and dimensions. The Nikon D3100 comes with outside measurements of 124mm x 96mm x 75mm (4.9" x 3.8" x 3.0") along with a weight of 505 grams (1.11 lbs) and the Sony A77 has dimensions of 143mm x 104mm x 81mm (5.6" x 4.1" x 3.2") along with a weight of 732 grams (1.61 lbs).

Check out the Nikon D3100 vs Sony A77 in our newest Camera plus Lens Size Comparison Tool.

Always remember, the weight of an ILC will change depending on the lens you have chosen at that time. Following is a front view measurements comparison of the D3100 and the A77.

Taking into account size and weight, the portability score of the D3100 and A77 is 68 and 59 respectively.

Usually, it is very hard to envision the contrast in sensor dimensions only by checking out specs. The picture underneath may give you a more clear sense of the sensor measurements in the D3100 and A77.

All in all, each of these cameras provide the same sensor dimensions but not the same resolution. You can expect to see the Sony A77 to provide extra detail because of its extra 10MP. Greater resolution will allow you to crop images more aggressively. The more aged D3100 will be disadvantaged in sensor innovation.