Pentax 645D vs Pentax K-3

Lets look much closer at the Pentax 645D and Pentax K-3, one being a Pro DSLR and the other is a Advanced DSLR and they are both sold by Pentax. There is a big difference among the sensor resolutions of the 645D (40MP) and K-3 (24MP) and the 645D (Medium format) and K-3 (APS-C) boast different sensor sizing.

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The 645D was brought out 5 years before the K-3 and that is a fairly big gap as far as camera tech is concerned. The two cameras have different body design with the Pentax 645D being a Large SLR camera and the Pentax K-3 being a Mid-size SLR camera.

Before getting right into a complete comparison, here is a short overview of how the 645D scores versus the K-3 with respect to portability, imaging, features and an overall grade.

This is a sample of the gallery pics for Pentax 645D and Pentax K-3. The entire galleries are viewable at Pentax 645D Gallery and Pentax K-3 Gallery.

If you're looking to lug around your camera, you should think about its weight and size. The Pentax 645D has outside dimensions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") along with a weight of 1480 grams (3.26 lbs) while the Pentax K-3 has specifications of 131mm x 100mm x 77mm (5.2" x 3.9" x 3.0") accompanied by a weight of 800 grams (1.76 lbs).

Examine the Pentax 645D and Pentax K-3 in the all new Camera and Lens Size Comparison Tool.

Remember, the weight of an Interchangeable Lens Camera will vary based on the lens you choose during that time. Following is a front view over all size comparison of the 645D against the K-3.

Looking at size and weight, the portability grade of the 645D and K-3 is 50 and 59 respectively.

Often, its difficult to imagine the difference in sensor measurements merely by researching technical specs. The photograph here will help provide you a stronger sense of the sensor dimensions in the 645D and K-3.

As you have seen, each of the cameras provide different megapixel count and different sensor measurements. The 645D featuring a larger sensor is going to make achieving bokeh less difficult and the Pentax 645D will result in more detail having its extra 16MP. Greater resolution will allow you to crop photos more aggressively. The older 645D will be behind with regard to sensor technology.