Pentax 645Z vs Sony A7 III

Its time to look closer at the Pentax 645Z versus Sony A7 III, one is a Pro DSLR and the latter is a Pro Mirrorless by rivals Pentax and Sony. There exists a sizeable gap among the sensor resolutions of the 645Z (51MP) and A7 III (24MP) and the 645Z (Medium format) and A7 III (Full frame) have different sensor sizes.

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The 645Z was unveiled 4 years earlier than the A7 III which is a fairly large gap as far as camera technology is concerned. Both of these cameras have different body design with the Pentax 645Z being a Large SLR camera and the Sony A7 III being a SLR-style mirrorless camera.

Before delving right into a detailed comparison, here is a brief introduction of how the 645Z grades against the A7 III in relation to portability, imaging, features and an overall score.

Below is a preview of the gallery photos for Pentax 645Z and Sony Alpha A7 III. The full galleries are provided at Pentax 645Z Gallery and Sony A7 III Gallery.

For anybody who is planning to carry around your camera regularly, you have to factor in its weight and size. The Pentax 645Z features exterior measurements of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") accompanied by a weight of 1550 grams (3.42 lbs) whilst the Sony A7 III has specifications of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") having a weight of 650 grams (1.43 lbs).

Take a look at the Pentax 645Z versus Sony A7 III in the all new Camera and Lens Size Comparison Tool.

Take into account, the weight of an Interchangeable Lens Camera will change depending on the lens you are utilising during that time. Here is a front view over all size comparison of the 645Z and the A7 III.

Considering dimensions and weight, the portability score of the 645Z and A7 III is 49 and 63 respectively.

Quite often, it's difficult to picture the difference in sensor sizes only by seeing technical specs. The picture underneath may provide you a stronger sense of the sensor measurements in the 645Z and A7 III.

As you have seen, both of these cameras provide different megapixels and different sensor sizes. The 645Z having a bigger sensor is going to make getting shallower DOF easier and the Pentax 645Z will provide more detail having an extra 27MP. Higher resolution will also make it easier to crop shots more aggressively. The more aged 645Z will be disadvantaged in sensor innovation.