OM System OM-1 vs Sony A7

In this write-up, we will be reviewing the OM System OM-1 versus Sony A7, both Pro Mirrorless digital cameras by rivals Olympus and Sony. The sensor resolution of the OM System OM-1 (20MP) and the A7 (24MP) is pretty similar but the OM System OM-1 (Four Thirds) and A7 (Full frame) possess totally different sensor sizing.

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The OM System OM-1 was manufactured 8 years after the A7 which is quite a big gap as far as tech is concerned. Each of the cameras offer the identical body type (SLR-style mirrorless).

Before diving in to a complete comparison, below is a concise summary of how the OM System OM-1 scores against the A7 with regards to portability, imaging, features and an overall mark.

Here is a preview of the gallery images for OM System OM-1 and Sony Alpha A7. The entire galleries are viewable at OM System OM-1 Gallery and Sony A7 Gallery.

For those who are planning to travel with your camera regularly, you'll have to think about its weight and dimensions. The OM System OM-1 enjoys physical measurements of 135mm x 92mm x 73mm (5.3" x 3.6" x 2.9") having a weight of 599 grams (1.32 lbs) while the Sony A7 has dimensions of 127mm x 94mm x 48mm (5.0" x 3.7" x 1.9") having a weight of 474 grams (1.04 lbs).

Compare the OM System OM-1 versus Sony A7 in the all new Camera and Lens Size Comparison Tool.

Take into account, the weight of an Interchangeable Lens Camera will vary dependant on the lens you are utilizing at that time. Following is the front view physical size comparison of the OM System OM-1 and the A7.

Looking at size and weight, the portability rating of the OM System OM-1 and A7 is 65 and 78 respectively.

Generally, it is very hard to visualise the contrast between sensor dimensions purely by going over a spec sheet. The pic below should give you a stronger sense of the sensor sizing in the OM System OM-1 and A7.

Clearly, both cameras offer different resolutions and different sensor dimensions. The OM System OM-1 featuring a tinier sensor will make shooting shallower depth of field tougher and the Sony A7 will offer you greater detail due to its extra 4MP. Higher resolution will also let you crop photographs a little more aggressively. The younger OM System OM-1 will have an edge when it comes to sensor tech.