Sigma SD9 vs Sony A55

The following is a complete comparison of the Sigma SD9 and Sony A55, one is a Advanced DSLR and the latter is a Entry-Level DSLR by brands Sigma and Sony. There exists a significant gap between the sensor resolutions of the SD9 (3MP) and A55 (16MP) but they come with the same exact sensor dimensions (APS-C).

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The SD9 was announced 8 years before the A55 which is quite a sizable gap as far as technology is concerned. Both of the cameras offer different body type with the Sigma SD9 being a Mid-size SLR camera and the Sony A55 being a Compact SLR camera.

Before delving through a complete comparison, below is a quick overview of how the SD9 scores against the A55 in terms of portability, imaging, features and an overall mark.

Below is a preview of the gallery images for Sigma SD9 and Sony SLT-A55. The whole galleries are available at Sigma SD9 Gallery and Sony A55 Gallery.

For anyone who is intending to travel with your camera often, you'll need to consider its weight and measurements. The Sigma SD9 provides outer measurements of 152mm x 120mm x 79mm (6.0" x 4.7" x 3.1") with a weight of 950 grams (2.09 lbs) while the Sony A55 has proportions of 124mm x 92mm x 85mm (4.9" x 3.6" x 3.3") along with a weight of 500 grams (1.10 lbs).

Analyze the Sigma SD9 and Sony A55 in the latest Camera and Lens Size Comparison Tool.

Remember that, the weight of an Interchangeable Lens Camera will vary depending on the lens you are utilising at that time. Following is the front view measurements comparison of the SD9 compared to the A55.

Taking into account dimensions and weight, the portability rating of the SD9 and A55 is 54 and 67 respectively.

More often than not, its tough to visualize the gap between sensor dimensions merely by reading through specs. The image here might provide you a much better sense of the sensor sizing in the SD9 and A55.

All in all, each of these cameras offer the same exact sensor sizing albeit different megapixels. You should expect the Sony A55 to resolve extra detail with its extra 13 Megapixels. Higher resolution can also enable you to crop pictures a little more aggressively. The more aged SD9 is going to be behind in sensor technology.