Sigma SD9 vs Sony A7S III

On this page, we will be matching up the Sigma SD9 and Sony A7S III, one being a Advanced DSLR and the latter is a Pro Mirrorless by competitors Sigma and Sony. There exists a crucial gap between the resolutions of the SD9 (3MP) and A7S III (12MP) and the SD9 (APS-C) and A7S III (Full frame) boast different sensor sizes.

Photography Glossary

The SD9 was announced 18 years earlier than the A7S III and that is quite a serious gap as far as technology is concerned. Both cameras have different body design with the Sigma SD9 being a Mid-size SLR camera and the Sony A7S III being a SLR-style mirrorless camera.

Before going into a full comparison, here is a concise synopsis of how the SD9 matches up versus the A7S III with regards to portability, imaging, features and an overall rating.

The following is a preview of the gallery images for Sigma SD9 and Sony Alpha A7S III. The whole galleries are available at Sigma SD9 Gallery and Sony A7S III Gallery.

For anybody who is going to carry your camera often, you're going to have to take into account its weight and volume. The Sigma SD9 comes with physical measurements of 152mm x 120mm x 79mm (6.0" x 4.7" x 3.1") along with a weight of 950 grams (2.09 lbs) and the Sony A7S III has sizing of 129mm x 97mm x 81mm (5.1" x 3.8" x 3.2") along with a weight of 699 grams (1.54 lbs).

Check the Sigma SD9 and Sony A7S III in the new Camera with Lens Size Comparison Tool.

Always remember, the weight of an Interchangeable Lens Camera will differ depending on the lens you use at that time. Below is a front view physical size comparison of the SD9 against the A7S III.

Taking into account dimensions and weight, the portability rating of the SD9 and A7S III is 54 and 61 respectively.

Quite often, it can be hard to picture the gap between sensor sizing only by checking specs. The visual below should provide you a far better sense of the sensor measurements in the SD9 and A7S III.

As you can plainly see, the two cameras have different resolutions and different sensor sizing. The SD9 using its tinier sensor is going to make achieving bokeh trickier and the Sony A7S III will give you extra detail with its extra 9 Megapixels. Higher resolution can also help you crop pictures a bit more aggressively. The older SD9 is going to be disadvantaged when it comes to sensor technology.