Olympus E-M1 III vs Pentax W90

In this write-up, we will be evaluating the Olympus E-M1 III and Pentax W90, former being a Pro Mirrorless while the latter is a Waterproof by rivals Olympus and Pentax. There is a substantial difference between the sensor resolutions of the E-M1 III (20MP) and W90 (12MP) and the E-M1 III (Four Thirds) and W90 (1/2.3") possess different sensor sizing.

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The E-M1 III was released 10 years later than the W90 and that is quite a big difference as far as tech is concerned. Both the cameras offer different body type with the Olympus E-M1 III being a SLR-style mirrorless camera and the Pentax W90 being a Compact camera.

Before we go straight into a full comparison, below is a simple summary of how the E-M1 III matches up against the W90 when it comes to portability, imaging, features and an overall rating.

This is a preview of the gallery photos for Olympus OM-D E-M1 Mark III & Pentax Optio W90. The complete galleries are viewable at Olympus E-M1 III Gallery & Pentax W90 Gallery.

For anyone who is going to carry your camera regularly, you need to take into account its weight and proportions. The Olympus E-M1 III features physical measurements of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") having a weight of 580 grams (1.28 lbs) whilst the Pentax W90 has measurements of 108mm x 59mm x 25mm (4.3" x 2.3" x 1.0") and a weight of 164 grams (0.36 lbs).

Take a look at the Olympus E-M1 III and Pentax W90 in our brand new Camera plus Lens Size Comparison Tool.

Always remember, the weight of an ILC will change based on the lens you select at that moment. Here is the front view physical size comparison of the E-M1 III against the W90.

Taking into account size and weight, the portability grade of the E-M1 III and W90 is 67 and 94 respectively.

In many cases, its difficult to imagine the contrast between sensor sizing just by looking at technical specs. The visual here will provide you a better sense of the sensor measurements in the E-M1 III and W90.

As you can tell, both of these cameras enjoy different megapixels and different sensor sizing. The E-M1 III due to its bigger sensor is going to make shooting shallow depth of field easier and the Olympus E-M1 III will give greater detail as a result of its extra 8MP. Higher resolution will also make it easier to crop shots far more aggressively. The more recent E-M1 III should have a benefit when it comes to sensor innovation.