OM System OM-1 vs Sony A7R

The following is a complete review of the OM System OM-1 versus Sony A7R, both Pro Mirrorless digital cameras by companies Olympus and Sony. There is a significant difference between the image resolutions of the OM System OM-1 (20MP) and A7R (36MP) and the OM System OM-1 (Four Thirds) and A7R (Full frame) feature different sensor size.

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The OM System OM-1 was revealed 8 years after the A7R which is quite a sizable gap as far as tech is concerned. Both the cameras come with the identical body type (SLR-style mirrorless).

Before we go in to a more detailed comparison, below is a quick synopsis of how the OM System OM-1 scores vs the A7R when considering portability, imaging, features and an overall mark.

The following is a preview of the gallery images for OM System OM-1 and Sony Alpha A7R. The full galleries are provided at OM System OM-1 Gallery and Sony A7R Gallery.

If you're planning to travel with your camera often, you're going to have to factor its weight and measurements. The OM System OM-1 features outer dimensions of 135mm x 92mm x 73mm (5.3" x 3.6" x 2.9") accompanied by a weight of 599 grams (1.32 lbs) and the Sony A7R has proportions of 127mm x 94mm x 48mm (5.0" x 3.7" x 1.9") accompanied by a weight of 465 grams (1.03 lbs).

Check out the OM System OM-1 versus Sony A7R in the new Camera and Lens Size Comparison Tool.

Do not forget, the weight of an Interchangeable Lens Camera will change based on the lens you have attached at the time. The following is the front view over all size comparison of the OM System OM-1 against the A7R.

Taking into account size and weight, the portability score of the OM System OM-1 and A7R is 65 and 78 respectively.

Oftentimes, it is tough to picture the gap between sensor dimensions only by checking a spec sheet. The image below might provide you a greater sense of the sensor sizes in the OM System OM-1 and A7R.

As you can see, both of the cameras posses different megapixel count and different sensor dimensions. The OM System OM-1 having a tinier sensor is going to make achieving shallow depth of field more difficult and the Sony A7R will resolve more detail because of its extra 16MP. Higher resolution will help you crop shots somewhat more aggressively. The fresher OM System OM-1 should have an advantage with regard to sensor innovation.