Pentax K-S2 vs Sony A7R III

Here, we will be looking at the Pentax K-S2 versus Sony A7R III, former being a Entry-Level DSLR while the latter is a Pro Mirrorless by rivals Pentax and Sony. There is a considerable difference among the sensor resolutions of the K-S2 (20MP) and A7R III (42MP) and the K-S2 (APS-C) and A7R III (Full frame) offer totally different sensor measurements.

Japan-exclusive Leica Leitz Phone 3 features big sensor and new modes

The K-S2 was introduced 3 years earlier than the A7R III and that is a fairly large difference as far as camera tech is concerned. Both of the cameras feature different body design with the Pentax K-S2 being a Compact SLR camera and the Sony A7R III being a SLR-style mirrorless camera.

Before delving into a comprehensive comparison, here is a quick overview of how the K-S2 scores against the A7R III in regards to portability, imaging, features and an overall grade.

Following is a preview of the gallery images for Pentax K-S2 & Sony Alpha A7R III. The whole galleries are provided at Pentax K-S2 Gallery & Sony A7R III Gallery.

If you are intending to lug around your camera frequently, you will need to consider its weight and volume. The Pentax K-S2 has got physical measurements of 123mm x 91mm x 73mm (4.8" x 3.6" x 2.9") with a weight of 678 grams (1.49 lbs) whilst the Sony A7R III has sizing of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") having a weight of 657 grams (1.45 lbs).

Check the Pentax K-S2 versus Sony A7R III in our brand new Camera plus Lens Size Comparison Tool.

Don't forget, the weight of an ILC will differ based on the lens you use during that time. Here is a front view size comparison of the K-S2 against the A7R III.

Using size and weight, the portability grade of the K-S2 and A7R III is 64 and 63 respectively.

In many cases, it is tough to visualise the gap in sensor measurements just by going through specifications. The graphic underneath should give you a more clear sense of the sensor measurements in the K-S2 and A7R III.

Plainly, both of those cameras feature different megapixel count and different sensor measurements. The K-S2 having a smaller sensor will make achieving shallower DOF tougher and the Sony A7R III will provide greater detail using its extra 22MP. Higher resolution will also help you crop shots way more aggressively. The older K-S2 will be disadvantaged when it comes to sensor innovation.