Pentax 645D vs Sony A9

Here is a extended assessment of the Pentax 645D vs Sony A9, one being a Pro DSLR and the other is a Pro Mirrorless by rivals Pentax and Sony. There exists a sizeable gap between the resolutions of the 645D (40MP) and A9 (24MP) and the 645D (Medium format) and A9 (Full frame) have totally different sensor size.

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The 645D was manufactured 8 years prior to the A9 and that is quite a large gap as far as technology is concerned. Both of the cameras have different body design with the Pentax 645D being a Large SLR camera and the Sony A9 being a SLR-style mirrorless camera.

Before delving straight to a detailed comparison, here is a brief view of how the 645D matches up versus the A9 with regards to portability, imaging, features and an overall rating.

Here is a sample of the gallery pics for Pentax 645D and Sony Alpha A9. The entire galleries are provided at Pentax 645D Gallery and Sony A9 Gallery.

For those who are intending to carry your camera regularly, you need to take into account its weight and proportions. The Pentax 645D enjoys outside dimensions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") and a weight of 1480 grams (3.26 lbs) while the Sony A9 has measurements of 127mm x 96mm x 63mm (5.0" x 3.8" x 2.5") accompanied by a weight of 673 grams (1.48 lbs).

Check the Pentax 645D vs Sony A9 in the all new Camera and Lens Size Comparison Tool.

Take into account, the weight of an Interchangeable Lens Camera will vary based on the lens you have attached at that time. Here is a front view over all size comparison of the 645D and the A9.

Factoring in dimensions and weight, the portability score of the 645D and A9 is 50 and 65 respectively.

Quite often, it is hard to envision the difference between sensor sizing purely by reading through specifications. The graphic underneath may provide you a stronger sense of the sensor sizes in the 645D and A9.

To sum up, the 2 cameras have different megapixel count and different sensor sizing. The 645D because of its larger sensor will make achieving bokeh easier and the Pentax 645D will give you more detail due to its extra 16MP. Greater resolution can also make it easier to crop pics a bit more aggressively. The older 645D is going to be behind when it comes to sensor technology.