Sigma SD9 vs Sony A7 III

Here, we are analyzing the Sigma SD9 and Sony A7 III, former being a Advanced DSLR while the other is a Pro Mirrorless by manufacturers Sigma and Sony. There is a noticeable difference among the image resolutions of the SD9 (3MP) and A7 III (24MP) and the SD9 (APS-C) and A7 III (Full frame) have different sensor measurements.

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The SD9 was manufactured 16 years earlier than the A7 III and that is a fairly sizable difference as far as camera tech is concerned. Both the cameras feature different body design with the Sigma SD9 being a Mid-size SLR camera and the Sony A7 III being a SLR-style mirrorless camera.

Before delving into a complete comparison, here is a brief introduction of how the SD9 grades versus the A7 III when it comes to portability, imaging, features and an overall grade.

Following is a sample of the gallery pics for Sigma SD9 & Sony Alpha A7 III. The entire galleries are available at Sigma SD9 Gallery & Sony A7 III Gallery.

If you are aiming to lug around your camera, you need to consider its weight and dimensions. The Sigma SD9 comes with outer measurements of 152mm x 120mm x 79mm (6.0" x 4.7" x 3.1") having a weight of 950 grams (2.09 lbs) and the Sony A7 III has dimensions of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") along with a weight of 650 grams (1.43 lbs).

Examine the Sigma SD9 and Sony A7 III in our brand new Camera plus Lens Size Comparison Tool.

Always remember, the weight of an ILC will vary based on the lens you choose at the time. Below is a front view overall size comparison of the SD9 against the A7 III.

Factoring in size and weight, the portability score of the SD9 and A7 III is 54 and 63 respectively.

Usually, it's tough to imagine the contrast in sensor measurements merely by going through a spec sheet. The photograph underneath should give you a greater sense of the sensor sizing in the SD9 and A7 III.

As you can see, both the cameras come with different megapixel count and different sensor measurements. The SD9 because of its smaller sensor is going to make achieving shallower depth of field tougher and the Sony A7 III will show extra detail due to its extra 21 Megapixels. Greater resolution will make it easier to crop photos a good deal more aggressively. The older SD9 will be behind with regard to sensor technology.