OM System OM-1 vs Sony A7 III

Below, we are looking at the OM System OM-1 and Sony A7 III, both Pro Mirrorless cameras by manufacturers Olympus and Sony. The sensor resolution of the OM System OM-1 (20MP) and the A7 III (24MP) is fairly close but the OM System OM-1 (Four Thirds) and A7 III (Full frame) enjoy different sensor sizes.

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The OM System OM-1 was released 4 years after the A7 III which is a fairly large difference as far as camera tech is concerned. Each of the cameras come with the identical body type (SLR-style mirrorless).

Before getting through a thorough comparison, below is a short summary of how the OM System OM-1 matches up versus the A7 III when it comes to portability, imaging, features and an overall score.

The following is a sample of the gallery pictures for OM System OM-1 & Sony Alpha A7 III. The complete galleries are available at OM System OM-1 Gallery & Sony A7 III Gallery.

In case you're looking to carry around your camera regularly, you'll need to factor in its weight and measurements. The OM System OM-1 has got physical measurements of 135mm x 92mm x 73mm (5.3" x 3.6" x 2.9") along with a weight of 599 grams (1.32 lbs) while the Sony A7 III has proportions of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") along with a weight of 650 grams (1.43 lbs).

Check the OM System OM-1 and Sony A7 III in our brand new Camera plus Lens Size Comparison Tool.

Do not forget, the weight of an ILC will differ dependant on the lens you are utilizing at that moment. The following is the front view measurements comparison of the OM System OM-1 vs the A7 III.

Using size and weight, the portability score of the OM System OM-1 and A7 III is 65 and 63 respectively.

In many cases, it is tough to imagine the gap in sensor sizes purely by looking through specs. The picture here might provide you a greater sense of the sensor measurements in the OM System OM-1 and A7 III.

All in all, each of the cameras posses different megapixel count and different sensor sizes. The OM System OM-1 because of its smaller sensor is going to make getting shallow depth of field trickier and the Sony A7 III will result in extra detail as a result of its extra 4 Megapixels. Greater resolution will allow you to crop pics somewhat more aggressively. The more recent OM System OM-1 should have an edge with regard to sensor tech.