Pentax W90 vs Sony A7R III

Here is a in depth analysis of the Pentax W90 and Sony A7R III, one being a Waterproof and the other is a Pro Mirrorless by competitors Pentax and Sony. There is a sizeable difference among the resolutions of the W90 (12MP) and A7R III (42MP) and the W90 (1/2.3") and A7R III (Full frame) boast totally different sensor sizes.

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The W90 was released 8 years prior to the A7R III and that is a fairly large gap as far as camera tech is concerned. Each of the cameras have different body design with the Pentax W90 being a Compact camera and the Sony A7R III being a SLR-style mirrorless camera.

Before getting straight to a full comparison, here is a simple overview of how the W90 scores against the A7R III in relation to portability, imaging, features and an overall rating.

Following is a sample of the gallery pictures for Pentax Optio W90 and Sony Alpha A7R III. The complete galleries are available at Pentax W90 Gallery and Sony A7R III Gallery.

For anyone who is looking to carry your camera often, you will need to consider its weight and volume. The Pentax W90 enjoys external measurements of 108mm x 59mm x 25mm (4.3" x 2.3" x 1.0") accompanied by a weight of 164 grams (0.36 lbs) while the Sony A7R III has sizing of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") having a weight of 657 grams (1.45 lbs).

Look at the Pentax W90 and Sony A7R III in the all new Camera with Lens Size Comparison Tool.

Remember, the weight of an Interchangeable Lens Camera will change based on the lens you are utilizing at that time. Following is a front view dimensions comparison of the W90 compared to the A7R III.

Considering size and weight, the portability score of the W90 and A7R III is 94 and 63 respectively.

Often, it can be difficult to envision the gap in sensor sizing simply by viewing technical specs. The graphic underneath might give you a greater sense of the sensor measurements in the W90 and A7R III.

As you have seen, the two cameras provide different resolutions and different sensor sizing. The W90 featuring a smaller sensor will make achieving shallow DOF harder and the Sony A7R III will render more detail as a result of its extra 30MP. Greater resolution will allow you to crop images more aggressively. The older W90 will be disadvantaged with regard to sensor tech.