Pentax 645D vs Sony A7R IV

Its time to look closer at the Pentax 645D vs Sony A7R IV, one being a Pro DSLR and the latter is a Pro Mirrorless by competitors Pentax and Sony. There is a sizeable difference between the sensor resolutions of the 645D (40MP) and A7R IV (61MP) and the 645D (Medium format) and A7R IV (Full frame) come with totally different sensor sizes.

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The 645D was introduced 10 years earlier than the A7R IV and that is quite a large gap as far as tech is concerned. Both of the cameras come with different body type with the Pentax 645D being a Large SLR camera and the Sony A7R IV being a SLR-style mirrorless camera.

Before diving straight into a comprehensive comparison, below is a brief summation of how the 645D scores against the A7R IV when it comes to portability, imaging, features and an overall rating.

Following is a preview of the gallery photos for Pentax 645D and Sony Alpha A7R IV. The whole galleries are provided at Pentax 645D Gallery and Sony A7R IV Gallery.

If you are looking to carry your camera regularly, you have to think about its weight and proportions. The Pentax 645D comes with outside dimensions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") having a weight of 1480 grams (3.26 lbs) while the Sony A7R IV has measurements of 129mm x 96mm x 78mm (5.1" x 3.8" x 3.1") and a weight of 665 grams (1.47 lbs).

See the Pentax 645D vs Sony A7R IV in the new Camera and Lens Size Comparison Tool.

Remember that, the weight of an Interchangeable Lens Camera will change based on the lens you are employing at that moment. Below is the front view physical size comparison of the 645D versus the A7R IV.

Taking into account size and weight, the portability rating of the 645D and A7R IV is 50 and 62 respectively.

Generally, its difficult to visualise the gap between sensor sizing just by going over specifications. The visual underneath will provide you a far better sense of the sensor sizes in the 645D and A7R IV.

Plainly, both of those cameras have got different resolutions and different sensor sizing. The 645D having a bigger sensor will make getting shallow depth of field easier and the Sony A7R IV will offer you greater detail using its extra 21 Megapixels. Higher resolution will also enable you to crop pictures much more aggressively. The older 645D is going to be disadvantaged when it comes to sensor technology.