Pentax 645Z vs Sony A7S III

In this article, we will be analyzing the Pentax 645Z versus Sony A7S III, one is a Pro DSLR and the latter is a Pro Mirrorless by brands Pentax and Sony. There is a big difference among the resolutions of the 645Z (51MP) and A7S III (12MP) and the 645Z (Medium format) and A7S III (Full frame) come with totally different sensor sizing.

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The 645Z was revealed 7 years prior to the A7S III which is a fairly big gap as far as camera tech is concerned. Both of the cameras offer different body type with the Pentax 645Z being a Large SLR camera and the Sony A7S III being a SLR-style mirrorless camera.

Before getting through a detailed comparison, below is a simple highlight of how the 645Z scores against the A7S III in regards to portability, imaging, features and an overall score.

Following is a preview of the gallery images for Pentax 645Z and Sony Alpha A7S III. The full galleries are available at Pentax 645Z Gallery and Sony A7S III Gallery.

In case you're going to carry around your camera often, you're going to have to think about its weight and size. The Pentax 645Z has outside dimensions of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") with a weight of 1550 grams (3.42 lbs) and the Sony A7S III has specifications of 129mm x 97mm x 81mm (5.1" x 3.8" x 3.2") having a weight of 699 grams (1.54 lbs).

Contrast the Pentax 645Z versus Sony A7S III in the all new Camera and Lens Size Comparison Tool.

Bear in mind, the weight of an Interchangeable Lens Camera will differ depending on the lens you have attached during that time. Underneath is the front view over all size comparison of the 645Z against the A7S III.

Using size and weight, the portability grade of the 645Z and A7S III is 49 and 61 respectively.

Generally, it is difficult to visualise the gap in sensor sizes merely by seeing specifications. The pic here will offer you a stronger sense of the sensor dimensions in the 645Z and A7S III.

To sum up, the 2 cameras enjoy different megapixels and different sensor sizes. The 645Z with its bigger sensor will make getting shallower DOF less difficult and the Pentax 645Z will provide extra detail because of its extra 39MP. Higher resolution will also make it easier to crop shots far more aggressively. The more aged 645Z will be behind with regard to sensor tech.