Olympus E-PM1 vs Sony A7 III

Below is a comprehensive review of the Olympus E-PM1 vs Sony A7 III, former being a Entry-Level Mirrorless while the latter is a Pro Mirrorless by manufacturers Olympus and Sony. There exists a large gap among the image resolutions of the E-PM1 (12MP) and A7 III (24MP) and the E-PM1 (Four Thirds) and A7 III (Full frame) use different sensor sizes.

Photography Glossary

The E-PM1 was unveiled 7 years prior to the A7 III and that is a fairly serious difference as far as camera technology is concerned. Both cameras offer different body type with the Olympus E-PM1 being a Rangefinder-style mirrorless camera and the Sony A7 III being a SLR-style mirrorless camera.

Before getting in to a complete comparison, below is a short view of how the E-PM1 grades against the A7 III when considering portability, imaging, features and an overall grade.

The following is a preview of the gallery photos for Olympus PEN E-PM1 & Sony Alpha A7 III. The full galleries are available at Olympus E-PM1 Gallery & Sony A7 III Gallery.

In case you're aiming to lug around your camera regularly, you have to factor its weight and size. The Olympus E-PM1 has physical measurements of 110mm x 64mm x 34mm (4.3" x 2.5" x 1.3") along with a weight of 265 grams (0.58 lbs) and the Sony A7 III has specifications of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") having a weight of 650 grams (1.43 lbs).

Compare the Olympus E-PM1 vs Sony A7 III in our completely new Camera & Lens Size Comparison Tool.

Remember, the weight of an ILC will differ depending on the lens you are using at that moment. Following is the front view over all size comparison of the E-PM1 compared to the A7 III.

Taking into account dimensions and weight, the portability rating of the E-PM1 and A7 III is 89 and 63 respectively.

Quite often, its difficult to visualize the contrast in sensor measurements merely by viewing technical specs. The visual below should provide you a better sense of the sensor measurements in the E-PM1 and A7 III.

As you have seen, both of those cameras enjoy different megapixel count and different sensor measurements. The E-PM1 having a smaller sensor is going to make achieving shallower depth of field trickier and the Sony A7 III will result in greater detail having an extra 12MP. Higher resolution will help you crop shots far more aggressively. The older E-PM1 will be disadvantaged with regard to sensor technology.