OM System OM-5 vs Sony A7

In this article, we are contrasting the OM System OM-5 and Sony A7, former being a Advanced Mirrorless while the other is a Pro Mirrorless by brands Olympus and Sony. The sensor resolution of the OM System OM-5 (20MP) and the A7 (24MP) is fairly comparable but the OM System OM-5 (Four Thirds) and A7 (Full frame) come with different sensor sizing.

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The OM System OM-5 was manufactured 8 years later than the A7 and that is a fairly significant difference as far as camera technology is concerned. Each of these cameras offer the identical body type (SLR-style mirrorless).

Before delving in to a step-by-step comparison, below is a short highlight of how the OM System OM-5 matches up against the A7 in regards to portability, imaging, features and an overall rating.

The following is a sample of the gallery pictures for OM System OM-5 & Sony Alpha A7. The entire galleries are available at OM System OM-5 Gallery & Sony A7 Gallery.

For anybody who is looking to carry your camera, you will want to factor in its weight and dimensions. The OM System OM-5 comes with outer dimensions of 125mm x 85mm x 50mm (4.9" x 3.3" x 2.0") along with a weight of 414 grams (0.91 lbs) while the Sony A7 has dimensions of 127mm x 94mm x 48mm (5.0" x 3.7" x 1.9") along with a weight of 474 grams (1.04 lbs).

Take a look at the OM System OM-5 and Sony A7 in our newest Camera & Lens Size Comparison Tool.

Don't forget, the weight of an ILC will vary dependant on the lens you have during that time. Below is the front view physical size comparison of the OM System OM-5 vs the A7.

Taking into account dimensions and weight, the portability score of the OM System OM-5 and A7 is 80 and 78 respectively.

Sometimes, it is hard to visualize the difference in sensor sizing merely by checking out a spec sheet. The visual here will help offer you a much better sense of the sensor dimensions in the OM System OM-5 and A7.

Clearly, the two cameras offer different megapixel count and different sensor sizing. The OM System OM-5 due to its smaller sensor is going to make getting shallower DOF harder and the Sony A7 will provide more detail due to its extra 4 Megapixels. Greater resolution will also help you crop images a little more aggressively. The more modern OM System OM-5 provides a benefit in sensor technology.