OM System OM-1 vs Sony A7c

Below is a in depth assessment of the OM System OM-1 versus Sony A7c, one being a Pro Mirrorless and the latter is a Advanced Mirrorless by rivals Olympus and Sony. The sensor resolution of the OM System OM-1 (20MP) and the A7c (24MP) is relatively similar but the OM System OM-1 (Four Thirds) and A7c (Full frame) feature totally different sensor measurements.

Photography Glossary

The OM System OM-1 was revealed 18 months later than the A7c which makes the cameras a generation apart from each other. The two cameras offer different body type with the OM System OM-1 being a SLR-style mirrorless camera and the Sony A7c being a Rangefinder-style mirrorless camera.

Before delving straight into a complete comparison, below is a short overview of how the OM System OM-1 scores vs the A7c with respect to portability, imaging, features and an overall grade.

This is a preview of the gallery photos for OM System OM-1 and Sony Alpha A7c. The full galleries are viewable at OM System OM-1 Gallery and Sony A7c Gallery.

In case you're aiming to lug around your camera often, you'll have to take into account its weight and size. The OM System OM-1 offers outer 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) and the Sony A7c has specifications of 124mm x 71mm x 60mm (4.9" x 2.8" x 2.4") having a weight of 509 grams (1.12 lbs).

Look at the OM System OM-1 versus Sony A7c in the new Camera with Lens Size Comparison Tool.

Do not forget, the weight of an Interchangeable Lens Camera will vary based on the lens you have attached during that time. Below is the front view overall size comparison of the OM System OM-1 and the A7c.

Using size and weight, the portability score of the OM System OM-1 and A7c is 65 and 78 respectively.

Usually, its difficult to envision the contrast between sensor measurements only by reviewing a spec sheet. The graphic underneath should give you a far better sense of the sensor measurements in the OM System OM-1 and A7c.

As you can see, both of those cameras offer different resolutions and different sensor measurements. The OM System OM-1 using its tinier sensor will make getting shallower DOF tougher and the Sony A7c will offer you greater detail because of its extra 4MP. Higher resolution will also allow you to crop shots a little more aggressively. The newer OM System OM-1 will have a benefit with regard to sensor innovation.