Olympus E-M1 III vs Pentax E90

Here, we will be contrasting the Olympus E-M1 III and Pentax E90, former being a Pro Mirrorless while the latter is a Small Sensor Compact by rivals Olympus and Pentax. There is a large difference between the image resolutions of the E-M1 III (20MP) and E90 (10MP) and the E-M1 III (Four Thirds) and E90 (1/2.3") provide totally different sensor size.

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The E-M1 III was launched 10 years later than the E90 and that is quite a serious difference as far as tech is concerned. Both the cameras feature different body design with the Olympus E-M1 III being a SLR-style mirrorless camera and the Pentax E90 being a Compact camera.

Before diving straight to a comprehensive comparison, here is a simple overview of how the E-M1 III grades against the E90 with respect to portability, imaging, features and an overall grade.

The following is a preview of the gallery images for Olympus OM-D E-M1 Mark III & Pentax Optio E90. The complete galleries are provided at Olympus E-M1 III Gallery & Pentax E90 Gallery.

For anyone who is looking to lug around your camera, you will want to think about its weight and proportions. The Olympus E-M1 III has external measurements of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") accompanied by a weight of 580 grams (1.28 lbs) whilst the Pentax E90 has measurements of 102mm x 59mm x 25mm (4.0" x 2.3" x 1.0") with a weight of 145 grams (0.32 lbs).

See the Olympus E-M1 III and Pentax E90 in our brand new Camera & Lens Size Comparison Tool.

Always remember, the weight of an ILC will differ dependant on the lens you are employing at that time. Underneath is a front view scale comparison of the E-M1 III vs the E90.

Looking at size and weight, the portability grade of the E-M1 III and E90 is 67 and 94 respectively.

In many cases, it is very tough to visualise the contrast between sensor measurements purely by checking technical specs. The graphic here will help offer you a clearer sense of the sensor sizing in the E-M1 III and E90.

As you have seen, both of the cameras feature different resolutions and different sensor measurements. The E-M1 III because of its bigger sensor will make shooting bokeh less difficult and the Olympus E-M1 III will give you more detail utilizing its extra 10 Megapixels. Higher resolution can also enable you to crop photographs way more aggressively. The fresher E-M1 III is going to have an advantage with regard to sensor technology.