Pentax K-3 vs Sony A7R III

Let's look much closer at the Pentax K-3 and Sony A7R III, one is a Advanced DSLR and the latter is a Pro Mirrorless by manufacturers Pentax and Sony. There exists a sizeable gap among the sensor resolutions of the K-3 (24MP) and A7R III (42MP) and the K-3 (APS-C) and A7R III (Full frame) posses different sensor sizes.

Photography Glossary

The K-3 was revealed 4 years before the A7R III which is a fairly large gap as far as camera technology is concerned. Both the cameras feature different body design with the Pentax K-3 being a Mid-size SLR camera and the Sony A7R III being a SLR-style mirrorless camera.

Before delving into a comprehensive comparison, here is a short highlight of how the K-3 matches up vs the A7R III with regards to portability, imaging, features and an overall mark.

The following is a preview of the gallery photos for Pentax K-3 and Sony Alpha A7R III. The full galleries are provided at Pentax K-3 Gallery and Sony A7R III Gallery.

For those who are going to travel with your camera, you'll need to take into account its weight and proportions. The Pentax K-3 features exterior measurements of 131mm x 100mm x 77mm (5.2" x 3.9" x 3.0") having a weight of 800 grams (1.76 lbs) while the Sony A7R III has measurements 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 out the Pentax K-3 and Sony A7R III in the latest Camera with Lens Size Comparison Tool.

Keep in mind, the weight of an Interchangeable Lens Camera will differ dependant on the lens you select at that time. Here is a front view proportions comparison of the K-3 against the A7R III.

Considering dimensions and weight, the portability grade of the K-3 and A7R III is 59 and 63 respectively.

Typically, it's difficult to visualize the gap in sensor dimensions purely by looking through a spec sheet. The image underneath should give you a far better sense of the sensor measurements in the K-3 and A7R III.

As you can see, both cameras come with different megapixels and different sensor dimensions. The K-3 having a smaller sensor is going to make shooting bokeh harder and the Sony A7R III will result in greater detail because of its extra 18 Megapixels. Higher resolution will allow you to crop pictures a good deal more aggressively. The more aged K-3 will be disadvantaged when it comes to sensor innovation.