Pentax K100D vs Sony A7R III

Here is a thorough overview of the Pentax K100D versus Sony A7R III, former being a Entry-Level DSLR while the other is a Pro Mirrorless by manufacturers Pentax and Sony. There exists a sizable gap among the image resolutions of the K100D (6MP) and A7R III (42MP) and the K100D (APS-C) and A7R III (Full frame) enjoy totally different sensor sizing.

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The K100D was introduced 12 years before the A7R III and that is a fairly significant difference as far as camera technology is concerned. Each of the cameras offer different body type with the Pentax K100D being a Compact SLR camera and the Sony A7R III being a SLR-style mirrorless camera.

Before delving in to a full comparison, below is a brief overview of how the K100D scores against the A7R III in relation to portability, imaging, features and an overall rating.

Following is a sample of the gallery pics for Pentax K100D & Sony Alpha A7R III. The whole galleries are viewable at Pentax K100D Gallery & Sony A7R III Gallery.

For anybody who is intending to carry your camera often, you will have to consider its weight and proportions. The Pentax K100D has got physical measurements of 129mm x 93mm x 70mm (5.1" x 3.7" x 2.8") having a weight of 660 grams (1.46 lbs) whilst the Sony A7R III has measurements of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") accompanied by a weight of 657 grams (1.45 lbs).

Check out the Pentax K100D versus Sony A7R III in our newest Camera plus Lens Size Comparison Tool.

Remember, the weight of an ILC will change dependant on the lens you are utilizing during that time. Here is the front view sizing comparison of the K100D and the A7R III.

Taking into account dimensions and weight, the portability grade of the K100D and A7R III is 64 and 63 respectively.

Sometimes, it can be tough to see the gap in sensor sizing simply by looking through technical specs. The visual below will give you a much better sense of the sensor measurements in the K100D and A7R III.

As you have seen, each of the cameras enjoy different megapixels and different sensor sizing. The K100D having a smaller sensor will make shooting shallower DOF more challenging and the Sony A7R III will provide you with extra detail using its extra 36MP. Greater resolution will also let you crop pics far more aggressively. The older K100D will be disadvantaged with regard to sensor technology.