Pentax K20D vs Sony A7R III

Below is a complete comparison of the Pentax K20D versus Sony A7R III, one being a Advanced DSLR and the other is a Pro Mirrorless by competitors Pentax and Sony. There is a big difference between the image resolutions of the K20D (15MP) and A7R III (42MP) and the K20D (APS-C) and A7R III (Full frame) feature different sensor size.

Photobucket discusses licensing 13 billion images with AI firms

The K20D was brought out 10 years prior to the A7R III and that is quite a big gap as far as tech is concerned. Each of these cameras offer different body type with the Pentax K20D being a Mid-size SLR camera and the Sony A7R III being a SLR-style mirrorless camera.

Before getting in to a more detailed comparison, below is a quick summary of how the K20D scores against the A7R III for portability, imaging, features and an overall grade.

The following is a sample of the gallery pictures for Pentax K20D and Sony Alpha A7R III. The entire galleries are provided at Pentax K20D Gallery and Sony A7R III Gallery.

If you are going to lug around your camera regularly, you have to take into account its weight and volume. The Pentax K20D offers physical dimensions of 142mm x 101mm x 70mm (5.6" x 4.0" x 2.8") having a weight of 800 grams (1.76 lbs) while the Sony A7R III has sizing of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") accompanied by a weight of 657 grams (1.45 lbs).

Examine the Pentax K20D versus Sony A7R III in the all new Camera with Lens Size Comparison Tool.

Always remember, the weight of an Interchangeable Lens Camera will differ based on the lens you choose at the time. Following is the front view sizing comparison of the K20D and the A7R III.

Taking into account size and weight, the portability rating of the K20D and A7R III is 59 and 63 respectively.

Often, it is very difficult to picture the difference between sensor measurements purely by checking specifications. The visual here may offer you a better sense of the sensor dimensions in the K20D and A7R III.

To sum up, the 2 cameras offer different resolutions and different sensor measurements. The K20D due to its tinier sensor is going to make achieving shallow depth of field more challenging and the Sony A7R III will give more detail having its extra 27 Megapixels. Greater resolution will enable you to crop photos a little more aggressively. The older K20D is going to be behind in sensor innovation.