Pentax 645Z vs Sony A77

Below, we will be analyzing the Pentax 645Z versus Sony A77, former being a Pro DSLR while the latter is a Advanced DSLR by competitors Pentax and Sony. There is a considerable difference among the sensor resolutions of the 645Z (51MP) and A77 (24MP) and the 645Z (Medium format) and A77 (APS-C) come with totally different sensor dimensions.

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The 645Z was announced 2 years later than the A77 and that is a fairly large difference as far as camera tech is concerned. Both of these cameras come with different body type with the Pentax 645Z being a Large SLR camera and the Sony A77 being a Mid-size SLR camera.

Before delving straight into a more detailed comparison, below is a concise overview of how the 645Z grades versus the A77 in regards to portability, imaging, features and an overall grade.

Below is a preview of the gallery images for Pentax 645Z & Sony SLT-A77. The whole galleries are available at Pentax 645Z Gallery & Sony A77 Gallery.

For anyone who is aiming to lug around your camera often, you're going to have to consider its weight and volume. The Pentax 645Z has external measurements of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") along with a weight of 1550 grams (3.42 lbs) whilst the Sony A77 has sizing of 143mm x 104mm x 81mm (5.6" x 4.1" x 3.2") with a weight of 732 grams (1.61 lbs).

Check the Pentax 645Z versus Sony A77 in our newest Camera plus Lens Size Comparison Tool.

Keep in mind, the weight of an ILC will change dependant on the lens you select at that time. Following is the front view dimension comparison of the 645Z vs the A77.

Using size and weight, the portability score of the 645Z and A77 is 49 and 59 respectively.

Often, it is tough to visualise the gap in sensor measurements simply by going through specs. The photograph below will help provide you a much better sense of the sensor measurements in the 645Z and A77.

As you can plainly see, both the cameras have got different megapixels and different sensor measurements. The 645Z using its bigger sensor will make achieving shallow depth of field easier and the Pentax 645Z will provide more detail with its extra 27MP. Higher resolution will make it easier to crop shots much more aggressively. The fresher 645Z will have an edge with regard to sensor tech.