Sigma SD9 vs Sony A7R III

Below, we are reviewing the Sigma SD9 and Sony A7R III, one being a Advanced DSLR and the other is a Pro Mirrorless by brands Sigma and Sony. There is a big difference between the resolutions of the SD9 (3MP) and A7R III (42MP) and the SD9 (APS-C) and A7R III (Full frame) feature totally different sensor measurements.

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The SD9 was announced 16 years prior to the A7R III and that is quite a big gap as far as tech is concerned. Both the cameras come with different body type with the Sigma SD9 being a Mid-size SLR camera and the Sony A7R III being a SLR-style mirrorless camera.

Before getting through a comprehensive comparison, below is a concise introduction of how the SD9 grades versus the A7R III in terms of portability, imaging, features and an overall grade.

This is a sample of the gallery pics for Sigma SD9 and Sony Alpha A7R III. The whole galleries are available at Sigma SD9 Gallery and Sony A7R III Gallery.

For those who are looking to lug around your camera regularly, you will want to factor its weight and measurements. The Sigma SD9 offers outer dimensions of 152mm x 120mm x 79mm (6.0" x 4.7" x 3.1") accompanied by a weight of 950 grams (2.09 lbs) whilst the Sony A7R III has proportions of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") along with a weight of 657 grams (1.45 lbs).

Check the Sigma SD9 and Sony A7R III in the new Camera with Lens Size Comparison Tool.

Bear in mind, the weight of an Interchangeable Lens Camera will differ based on the lens you are using during that time. Here is the front view dimension comparison of the SD9 and the A7R III.

Taking into consideration size and weight, the portability score of the SD9 and A7R III is 54 and 63 respectively.

Generally, it is difficult to envision the contrast between sensor measurements purely by reading specifications. The visual underneath might provide you a much better sense of the sensor sizes in the SD9 and A7R III.

To sum up, both the cameras posses different megapixels and different sensor measurements. The SD9 having a tinier sensor will make getting shallow DOF more difficult and the Sony A7R III will offer you more detail with its extra 39 Megapixels. Greater resolution can also allow you to crop pics somewhat more aggressively. The older SD9 is going to be behind in sensor innovation.