Sigma SD15 vs Sony A57

Below is a extended analysis of the Sigma SD15 versus Sony A57, one being a Advanced DSLR and the other is a Entry-Level DSLR by manufacturers Sigma and Sony. There is a big difference between the resolutions of the SD15 (5MP) and A57 (16MP) but both cameras provide the identical sensor sizes (APS-C).

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The SD15 was brought out 3 years prior to the A57 and that is quite a big gap as far as tech is concerned. The two cameras feature different body design with the Sigma SD15 being a Mid-size SLR camera and the Sony A57 being a Compact SLR camera.

Before diving into a complete comparison, here is a simple synopsis of how the SD15 scores versus the A57 when it comes to portability, imaging, features and an overall grade.

Below is a sample of the gallery pictures for Sigma SD15 and Sony SLT-A57. The entire galleries are provided at Sigma SD15 Gallery and Sony A57 Gallery.

If you're looking to lug around your camera, you'll need to take into account its weight and size. The Sigma SD15 comes with outer dimensions of 144mm x 107mm x 81mm (5.7" x 4.2" x 3.2") accompanied by a weight of 750 grams (1.65 lbs) while the Sony A57 has specifications of 132mm x 98mm x 81mm (5.2" x 3.9" x 3.2") accompanied by a weight of 618 grams (1.36 lbs).

Check the Sigma SD15 versus Sony A57 in the new Camera with Lens Size Comparison Tool.

Do not forget, the weight of an Interchangeable Lens Camera will differ based on the lens you are employing at that moment. Below is a front view overall size comparison of the SD15 against the A57.

Taking into consideration size and weight, the portability rating of the SD15 and A57 is 59 and 64 respectively.

Often, it can be hard to visualise the contrast between sensor measurements purely by reading through specs. The graphic here may provide you a much better sense of the sensor sizes in the SD15 and A57.

All in all, both cameras feature the identical sensor size but not the same megapixels. You should anticipate the Sony A57 to resolve extra detail having its extra 11 Megapixels. Greater resolution will also allow you to crop photos way more aggressively. The older SD15 is going to be behind when it comes to sensor innovation.