Olympus E-420 vs Sony A7 III

In this write-up, we are comparing the Olympus E-420 versus Sony A7 III, one being a Entry-Level DSLR and the other is a Pro Mirrorless by competitors Olympus and Sony. There is a sizeable difference between the image resolutions of the E-420 (10MP) and A7 III (24MP) and the E-420 (Four Thirds) and A7 III (Full frame) possess different sensor sizes.

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The E-420 was brought out 10 years prior to the A7 III and that is quite a large gap as far as tech is concerned. Each of these cameras offer different body type with the Olympus E-420 being a Compact SLR camera and the Sony A7 III being a SLR-style mirrorless camera.

Before diving straight into a step-by-step comparison, below is a brief synopsis of how the E-420 matches up vs the A7 III in the way of portability, imaging, features and an overall grade.

This is a sample of the gallery pictures for Olympus E-420 and Sony Alpha A7 III. The entire galleries are available at Olympus E-420 Gallery and Sony A7 III Gallery.

For those who are looking to lug around your camera frequently, you're going to have to think about its weight and size. The Olympus E-420 provides external dimensions of 130mm x 91mm x 53mm (5.1" x 3.6" x 2.1") and a weight of 426 grams (0.94 lbs) whilst the Sony A7 III has specifications of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") along with a weight of 650 grams (1.43 lbs).

Contrast the Olympus E-420 versus Sony A7 III in the latest Camera with Lens Size Comparison Tool.

Bear in mind, the weight of an Interchangeable Lens Camera will vary depending on the lens you have chosen at that moment. The following is the front view sizing comparison of the E-420 against the A7 III.

Factoring in size and weight, the portability grade of the E-420 and A7 III is 77 and 63 respectively.

Usually, it's difficult to picture the difference between sensor measurements merely by checking specifications. The graphic below should give you a more clear sense of the sensor dimensions in the E-420 and A7 III.

Plainly, both cameras offer different megapixels and different sensor measurements. The E-420 featuring a tinier sensor is going to make shooting shallower depth of field harder and the Sony A7 III will give you greater detail having its extra 14 Megapixels. Greater resolution will also help you crop pics a little more aggressively. The older E-420 is going to be behind in sensor innovation.