Pentax K-S1 vs Sony A7 III

In this write-up, we are reviewing the Pentax K-S1 vs Sony A7 III, former is a Advanced DSLR while the other is a Pro Mirrorless by companies Pentax and Sony. The image resolution of the K-S1 (20MP) and the A7 III (24MP) is fairly well matched but the K-S1 (APS-C) and A7 III (Full frame) come with totally different sensor size.

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The K-S1 was released 4 years prior to the A7 III which is quite a big difference as far as tech is concerned. Both of the cameras offer different body type with the Pentax K-S1 being a Mid-size SLR camera and the Sony A7 III being a SLR-style mirrorless camera.

Before delving through a full comparison, below is a simple summation of how the K-S1 scores against the A7 III with regard to portability, imaging, features and an overall score.

Following is a sample of the gallery pictures for Pentax K-S1 & Sony Alpha A7 III. The complete galleries are provided at Pentax K-S1 Gallery & Sony A7 III Gallery.

For those who are intending to carry around your camera regularly, you need to consider its weight and size. The Pentax K-S1 provides exterior dimensions of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") along with a weight of 558 grams (1.23 lbs) and the Sony A7 III has specifications of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") having a weight of 650 grams (1.43 lbs).

Check out the Pentax K-S1 vs Sony A7 III in our newest Camera & Lens Size Comparison Tool.

Remember, the weight of an ILC will vary dependant on the lens you are utilizing at that moment. Below is the front view sizing comparison of the K-S1 versus the A7 III.

Taking into account size and weight, the portability score of the K-S1 and A7 III is 69 and 63 respectively.

In many cases, it can be tough to envision the contrast between sensor sizes simply by looking at a spec sheet. The picture below may offer you a clearer sense of the sensor dimensions in the K-S1 and A7 III.

As you can see, both of these cameras enjoy different megapixel count and different sensor sizes. The K-S1 featuring a tinier sensor will make getting shallower DOF more difficult and the Sony A7 III will resolve greater detail as a result of its extra 4MP. Greater resolution will also make it easier to crop images far more aggressively. The more aged K-S1 is going to be disadvantaged with regard to sensor innovation.