Pentax 645D vs Sony A390

Its time to look a little more in depth at the Pentax 645D versus Sony A390, one being a Pro DSLR and the other is a Entry-Level DSLR by brands Pentax and Sony. There is a significant difference among the image resolutions of the 645D (40MP) and A390 (14MP) and the 645D (Medium format) and A390 (APS-C) feature totally different sensor sizes.

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The 645D was announced 4 months earlier than the A390 and they are both of a similar generation. Each of these cameras come with different body type with the Pentax 645D being a Large SLR camera and the Sony A390 being a Compact SLR camera.

Before we go straight into a detailed comparison, below is a brief overview of how the 645D scores versus the A390 in relation to portability, imaging, features and an overall grade.

Below is a sample of the gallery pictures for Pentax 645D and Sony Alpha DSLR-A390. The whole galleries are viewable at Pentax 645D Gallery and Sony A390 Gallery.

If you are planning to lug around your camera regularly, you're going to have to factor its weight and volume. The Pentax 645D has outer measurements of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") and a weight of 1480 grams (3.26 lbs) and the Sony A390 has sizing of 128mm x 97mm x 86mm (5.0" x 3.8" x 3.4") and a weight of 549 grams (1.21 lbs).

See the Pentax 645D versus Sony A390 in the latest Camera and Lens Size Comparison Tool.

Do not forget, the weight of an Interchangeable Lens Camera will change depending on the lens you select during that time. Underneath is the front view sizing comparison of the 645D against the A390.

Taking into consideration size and weight, the portability score of the 645D and A390 is 50 and 66 respectively.

Often, it is very difficult to see the gap in sensor measurements purely by seeing technical specs. The graphic underneath will give you a better sense of the sensor sizing in the 645D and A390.

As you have seen, both cameras posses different megapixel count and different sensor measurements. The 645D using its larger sensor will make getting shallower depth of field less difficult and the Pentax 645D will produce extra detail with its extra 26MP. Greater resolution can also let you crop photos somewhat more aggressively.