Pentax 645D vs Sony RX100 III

Below, we are evaluating the Pentax 645D vs Sony RX100 III, former is a Pro DSLR while the other is a Large Sensor Compact by brands Pentax and Sony. There is a large difference among the image resolutions of the 645D (40MP) and RX100 III (20MP) and the 645D (Medium format) and RX100 III (1") use totally different sensor measurements.

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The 645D was introduced 5 years earlier than the RX100 III which is a fairly serious difference as far as camera tech is concerned. Both the cameras come with different body type with the Pentax 645D being a Large SLR camera and the Sony RX100 III being a Large Sensor Compact camera.

Before going through a complete comparison, below is a quick synopsis of how the 645D matches up vs the RX100 III for portability, imaging, features and an overall score.

The following is a sample of the gallery pics for Pentax 645D & Sony Cyber-shot DSC-RX100 III. The whole galleries are provided at Pentax 645D Gallery & Sony RX100 III Gallery.

If you are planning to carry around your camera frequently, you're going to have to factor its weight and measurements. The Pentax 645D comes with external measurements of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") and a weight of 1480 grams (3.26 lbs) whilst the Sony RX100 III has proportions of 102mm x 58mm x 41mm (4.0" x 2.3" x 1.6") accompanied by a weight of 290 grams (0.64 lbs).

Check the Pentax 645D vs Sony RX100 III in our brand new Camera plus Lens Size Comparison Tool.

Bear in mind, the weight of an ILC will differ dependant on the lens you have chosen at the time. Below is the front view physical size comparison of the 645D compared to the RX100 III.

Taking into consideration size and weight, the portability score of the 645D and RX100 III is 50 and 89 respectively.

Often, it can be hard to envision the contrast in sensor sizes purely by viewing specifications. The image underneath will help give you a stronger sense of the sensor sizing in the 645D and RX100 III.

Plainly, both cameras posses different resolutions and different sensor sizes. The 645D with its larger sensor will make getting shallower DOF easier and the Pentax 645D will render extra detail using its extra 20MP. Greater resolution will help you crop images somewhat more aggressively. The more aged 645D will be disadvantaged in sensor tech.