Pentax 645D vs Sony A7 III

Its time to look a little more closely at the Pentax 645D vs Sony A7 III, one being a Pro DSLR and the other is a Pro Mirrorless by rivals Pentax and Sony. There exists a huge gap between the sensor resolutions of the 645D (40MP) and A7 III (24MP) and the 645D (Medium format) and A7 III (Full frame) come with totally different sensor dimensions.

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The 645D was unveiled 9 years before the A7 III and that is quite a significant gap as far as technology is concerned. Both cameras offer different body type with the Pentax 645D being a Large SLR camera and the Sony A7 III being a SLR-style mirrorless camera.

Before diving in to a step-by-step comparison, below is a quick overview of how the 645D matches up versus the A7 III with respect to portability, imaging, features and an overall grade.

The following is a sample of the gallery pictures for Pentax 645D and Sony Alpha A7 III. The full galleries are viewable at Pentax 645D Gallery and Sony A7 III Gallery.

In case you're planning to lug around your camera frequently, you will have to think about its weight and volume. The Pentax 645D offers physical dimensions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") and a weight of 1480 grams (3.26 lbs) and the Sony A7 III has sizing of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") along with a weight of 650 grams (1.43 lbs).

Compare the Pentax 645D vs Sony A7 III in the all new Camera and Lens Size Comparison Tool.

Take into consideration, the weight of an Interchangeable Lens Camera will differ dependant on the lens you use at that time. Underneath is the front view scale comparison of the 645D and the A7 III.

Looking at dimensions and weight, the portability rating of the 645D and A7 III is 50 and 63 respectively.

Sometimes, it can be tough to see the contrast between sensor measurements just by looking at specifications. The photograph below might provide you a better sense of the sensor dimensions in the 645D and A7 III.

To sum up, both of the cameras offer different resolutions and different sensor measurements. The 645D with its larger sensor will make getting bokeh less difficult and the Pentax 645D will give more detail having an extra 16 Megapixels. Greater resolution will help you crop photos a little more aggressively. The older 645D is going to be behind when it comes to sensor tech.