Pentax K100D S vs Sony A9

On this page, we are looking at the Pentax K100D S versus Sony A9, former being a Entry-Level DSLR while the other is a Pro Mirrorless by companies Pentax and Sony. There is a noticeable difference among the image resolutions of the K100D S (6MP) and A9 (24MP) and the K100D S (APS-C) and A9 (Full frame) boast different sensor dimensions.

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The K100D S was launched 10 years before the A9 and that is a fairly sizable difference as far as camera tech is concerned. Both of the cameras have different body design with the Pentax K100D S being a Compact SLR camera and the Sony A9 being a SLR-style mirrorless camera.

Before delving into a comprehensive comparison, here is a brief highlight of how the K100D S grades against the A9 with regard to portability, imaging, features and an overall rating.

Here is a sample of the gallery pics for Pentax K100D Super & Sony Alpha A9. The complete galleries are viewable at Pentax K100D S Gallery & Sony A9 Gallery.

For anyone who is going to carry your camera regularly, you're going to have to take into account its weight and size. The Pentax K100D S offers physical measurements of 129mm x 91mm x 71mm (5.1" x 3.6" x 2.8") accompanied by a weight of 646 grams (1.42 lbs) while the Sony A9 has specifications of 127mm x 96mm x 63mm (5.0" x 3.8" x 2.5") and a weight of 673 grams (1.48 lbs).

Look at the Pentax K100D S versus Sony A9 in our brand new Camera & Lens Size Comparison Tool.

Take into account, the weight of an ILC will vary dependant on the lens you use at the time. Here is a front view measurements comparison of the K100D S versus the A9.

Taking into consideration size and weight, the portability rating of the K100D S and A9 is 65 and 65 respectively.

Generally, it's difficult to picture the difference in sensor sizing just by seeing a spec sheet. The visual here will help offer you a clearer sense of the sensor sizing in the K100D S and A9.

Clearly, both of these cameras have different megapixels and different sensor sizing. The K100D S due to its smaller sensor is going to make getting bokeh more difficult and the Sony A9 will show extra detail utilizing its extra 18MP. Greater resolution will allow you to crop photos a bit more aggressively. The older K100D S will be behind when it comes to sensor innovation.