Pentax 645Z vs Sony A7R III

Its time to look a little more in depth at the Pentax 645Z vs Sony A7R III, one is a Pro DSLR and the other is a Pro Mirrorless by competitors Pentax and Sony. There exists a big gap among the image resolutions of the 645Z (51MP) and A7R III (42MP) and the 645Z (Medium format) and A7R III (Full frame) have different sensor dimensions.

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The 645Z was revealed 4 years before the A7R III which is a fairly big gap as far as camera technology is concerned. Both cameras feature different body design with the Pentax 645Z being a Large SLR camera and the Sony A7R III being a SLR-style mirrorless camera.

Before we go into a in depth comparison, here is a concise summary of how the 645Z grades versus the A7R III with regards to portability, imaging, features and an overall mark.

The following is a sample of the gallery pics for Pentax 645Z and Sony Alpha A7R III. The full galleries are available at Pentax 645Z Gallery and Sony A7R III Gallery.

For those who are going to travel with your camera regularly, you will want to think about its weight and dimensions. The Pentax 645Z features external measurements of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") having a weight of 1550 grams (3.42 lbs) while the Sony A7R III has dimensions of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") along with a weight of 657 grams (1.45 lbs).

Compare the Pentax 645Z vs Sony A7R III in the all new Camera and Lens Size Comparison Tool.

Keep in mind, the weight of an Interchangeable Lens Camera will differ depending on the lens you have attached at that time. The following is a front view measurement comparison of the 645Z against the A7R III.

Taking into consideration dimensions and weight, the portability rating of the 645Z and A7R III is 49 and 63 respectively.

Normally, it is very tough to picture the difference in sensor dimensions merely by viewing specs. The pic below will provide you a better sense of the sensor sizing in the 645Z and A7R III.

As you can plainly see, both the cameras come with different resolutions and different sensor dimensions. The 645Z using its larger sensor is going to make getting shallow depth of field less difficult and the Pentax 645Z will provide you with extra detail because of its extra 9MP. Greater resolution will also help you crop photos a good deal more aggressively. The more aged 645Z will be disadvantaged with regard to sensor technology.