Olympus E-M10 IV vs Pentax 645D

Its time to look much closer at the Olympus E-M10 IV and Pentax 645D, former being a Entry-Level Mirrorless while the other is a Pro DSLR by brands Olympus and Pentax. There is a large difference between the sensor resolutions of the E-M10 IV (20MP) and 645D (40MP) and the E-M10 IV (Four Thirds) and 645D (Medium format) use totally different sensor size.

Photography Glossary

The E-M10 IV was released 10 years later than the 645D and that is quite a serious difference as far as tech is concerned. Each of these cameras offer different body type with the Olympus E-M10 IV being a SLR-style mirrorless camera and the Pentax 645D being a Large SLR camera.

Before getting straight into a comprehensive comparison, below is a quick highlight of how the E-M10 IV scores vs the 645D with regards to portability, imaging, features and an overall grade.

The following is a sample of the gallery pics for Olympus OM-D E-M10 IV & Pentax 645D. The complete galleries are available at Olympus E-M10 IV Gallery & Pentax 645D Gallery.

When you are planning to lug around your camera often, you will have to think about its weight and size. The Olympus E-M10 IV enjoys physical measurements of 122mm x 84mm x 49mm (4.8" x 3.3" x 1.9") accompanied by a weight of 383 grams (0.84 lbs) whilst the Pentax 645D has specifications of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") accompanied by a weight of 1480 grams (3.26 lbs).

See the Olympus E-M10 IV and Pentax 645D in our completely new Camera & Lens Size Comparison Tool.

Don't forget, the weight of an ILC will differ depending on the lens you are utilising at that time. The following is the front view dimensions comparison of the E-M10 IV vs the 645D.

Looking at size and weight, the portability score of the E-M10 IV and 645D is 81 and 50 respectively.

Oftentimes, it is hard to visualise the gap between sensor measurements only by checking specs. The visual below should offer you a far better sense of the sensor measurements in the E-M10 IV and 645D.

All in all, the 2 cameras offer different resolutions and different sensor measurements. The E-M10 IV due to its tinier sensor will make getting shallow DOF more challenging and the Pentax 645D will give you more detail as a result of its extra 20 Megapixels. Greater resolution will also let you crop pics a little more aggressively. The younger E-M10 IV will have an edge when it comes to sensor tech.