Nikon D5100 vs Sony A55

Let's look a little more in depth at the Nikon D5100 vs Sony A55, both Entry-Level DSLR cameras by competitors Nikon and Sony. The image resolution of the D5100 (16MP) and the A55 (16MP) is very close and they feature the same exact sensor measurements (APS-C).

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The D5100 was brought out 9 months later than the A55 so they are both of a similar generation. Both of the cameras offer the identical body type (Compact SLR).

Before diving straight into a thorough comparison, below is a brief introduction of how the D5100 matches up versus the A55 with respect to portability, imaging, features and an overall grade.

Following is a sample of the gallery pics for Nikon D5100 and Sony SLT-A55. The entire galleries are available at Nikon D5100 Gallery and Sony A55 Gallery.

If you are aiming to lug around your camera, you'll need to take into account its weight and volume. The Nikon D5100 provides exterior measurements of 128mm x 97mm x 79mm (5.0" x 3.8" x 3.1") and a weight of 560 grams (1.23 lbs) while the Sony A55 has sizing of 124mm x 92mm x 85mm (4.9" x 3.6" x 3.3") accompanied by a weight of 500 grams (1.10 lbs).

Check the Nikon D5100 vs Sony A55 in the new Camera and Lens Size Comparison Tool.

Do not forget, the weight of an Interchangeable Lens Camera will change dependant on the lens you have chosen during that time. Underneath is the front view measurements comparison of the D5100 versus the A55.

Using dimensions and weight, the portability score of the D5100 and A55 is 66 and 67 respectively.

Typically, it is difficult to envision the contrast in sensor measurements only by viewing specs. The graphic below might offer you a clearer sense of the sensor sizing in the D5100 and A55.

All in all, both of these cameras offer the same exact sensor sizing and the identical MP so you should expect comparable quality of photos however you have to consider the production date of the cameras into account. The newer D5100 is going to have a benefit when it comes to sensor technology.