Pentax 645Z vs Sony A57

Lets examine more in depth at the Pentax 645Z and Sony A57, former being a Pro DSLR while the latter is a Entry-Level DSLR by brands Pentax and Sony. There is a considerable difference among the image resolutions of the 645Z (51MP) and A57 (16MP) and the 645Z (Medium format) and A57 (APS-C) use totally different sensor measurements.

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The 645Z was brought out 20 months later than the A57 which makes the cameras a generation apart from each other. Each of the cameras offer different body type with the Pentax 645Z being a Large SLR camera and the Sony A57 being a Compact SLR camera.

Before diving through a detailed comparison, below is a quick summary of how the 645Z matches up versus the A57 with regard to portability, imaging, features and an overall grade.

Here is a preview of the gallery images for Pentax 645Z & Sony SLT-A57. The entire galleries are provided at Pentax 645Z Gallery & Sony A57 Gallery.

For anybody who is going to lug around your camera frequently, you have to take into account its weight and dimensions. The Pentax 645Z enjoys 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) whilst the Sony A57 has dimensions of 132mm x 98mm x 81mm (5.2" x 3.9" x 3.2") with a weight of 618 grams (1.36 lbs).

Compare the Pentax 645Z and Sony A57 in our newest Camera & Lens Size Comparison Tool.

Don't forget, the weight of an ILC will vary depending on the lens you are using at the time. Here is the front view proportions comparison of the 645Z against the A57.

Considering size and weight, the portability score of the 645Z and A57 is 49 and 64 respectively.

Usually, its hard to envision the difference in sensor measurements simply by researching specifications. The visual underneath will help provide you a better sense of the sensor dimensions in the 645Z and A57.

Plainly, each of the cameras offer different resolutions and different sensor measurements. The 645Z due to its bigger sensor will make getting shallower DOF easier and the Pentax 645Z will provide you with greater detail having its extra 35 Megapixels. Higher resolution will also enable you to crop shots a little more aggressively. The fresher 645Z is going to have an advantage when it comes to sensor tech.