Pentax 645Z vs Sony A390

Below is a comprehensive analysis of the Pentax 645Z vs Sony A390, former being a Pro DSLR while the latter is a Entry-Level DSLR by competitors Pentax and Sony. There exists a large gap among the resolutions of the 645Z (51MP) and A390 (14MP) and the 645Z (Medium format) and A390 (APS-C) offer different sensor sizing.

Photography Glossary

The 645Z was unveiled 3 years later than the A390 and that is a fairly serious difference as far as camera technology is concerned. Both of these cameras feature different body design with the Pentax 645Z being a Large SLR camera and the Sony A390 being a Compact SLR camera.

Before diving right into a step-by-step comparison, here is a brief introduction of how the 645Z matches up vs the A390 with regards to portability, imaging, features and an overall grade.

Below is a preview of the gallery images for Pentax 645Z & Sony Alpha DSLR-A390. The full galleries are viewable at Pentax 645Z Gallery & Sony A390 Gallery.

For anyone who is going to lug around your camera regularly, you'll have to factor in its weight and volume. The Pentax 645Z offers exterior measurements of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") along with a weight of 1550 grams (3.42 lbs) and the Sony A390 has sizing of 128mm x 97mm x 86mm (5.0" x 3.8" x 3.4") along with a weight of 549 grams (1.21 lbs).

See the Pentax 645Z vs Sony A390 in our newest Camera plus Lens Size Comparison Tool.

Do not forget, the weight of an ILC will differ dependant on the lens you use at that time. Underneath is a front view sizing comparison of the 645Z vs the A390.

Factoring in dimensions and weight, the portability grade of the 645Z and A390 is 49 and 66 respectively.

Normally, it can be difficult to imagine the difference in sensor measurements just by seeing a spec sheet. The graphic underneath will provide you a clearer sense of the sensor sizing in the 645Z and A390.

As you can see, both of those cameras feature different megapixels and different sensor measurements. The 645Z with its bigger sensor is going to make shooting shallow depth of field easier and the Pentax 645Z will show greater detail having an extra 37 Megapixels. Higher resolution will also make it easier to crop shots way more aggressively. The fresher 645Z provides an advantage when it comes to sensor technology.