Pentax 645D vs Sony A55

In this write-up, we are comparing the Pentax 645D versus Sony A55, former being a Pro DSLR while the other is a Entry-Level DSLR by competitors Pentax and Sony. There exists a large gap between the sensor resolutions of the 645D (40MP) and A55 (16MP) and the 645D (Medium format) and A55 (APS-C) possess totally different sensor sizes.

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The 645D was launched 5 months prior to the A55 which means that they are both of a similar age. Both of these cameras offer different body type with the Pentax 645D being a Large SLR camera and the Sony A55 being a Compact SLR camera.

Before we go in to a more detailed comparison, below is a concise highlight of how the 645D matches up vs the A55 in regards to portability, imaging, features and an overall grade.

Here is a sample of the gallery pics for Pentax 645D & Sony SLT-A55. The complete galleries are provided at Pentax 645D Gallery & Sony A55 Gallery.

If you are aiming to lug around your camera often, you'll have to think about its weight and size. The Pentax 645D offers outside dimensions 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 A55 has specifications of 124mm x 92mm x 85mm (4.9" x 3.6" x 3.3") and a weight of 500 grams (1.10 lbs).

Examine the Pentax 645D versus Sony A55 in our completely new Camera & Lens Size Comparison Tool.

Take into consideration, the weight of an ILC will change based on the lens you have during that time. Following is the front view sizing comparison of the 645D compared to the A55.

Looking at dimensions and weight, the portability grade of the 645D and A55 is 50 and 67 respectively.

Typically, it can be tough to envision the gap between sensor measurements only by looking at technical specs. The photograph underneath might offer you a far better sense of the sensor sizes in the 645D and A55.

As you can tell, the 2 cameras enjoy different megapixels and different sensor measurements. The 645D because of its larger sensor will make shooting shallower DOF easier and the Pentax 645D will give you more detail utilizing its extra 24 Megapixels. Greater resolution will also enable you to crop pics far more aggressively.