Pentax 645D vs Pentax K-3 II

In this write-up, we will be analyzing the Pentax 645D and Pentax K-3 II, one is a Pro DSLR and the latter is a Advanced DSLR and both are designed by Pentax. There exists a huge gap between the resolutions of the 645D (40MP) and K-3 II (24MP) and the 645D (Medium format) and K-3 II (APS-C) feature different sensor dimensions.

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The 645D was manufactured 6 years prior to the K-3 II which is quite a significant gap as far as technology is concerned. Both cameras offer different body type with the Pentax 645D being a Large SLR camera and the Pentax K-3 II being a Mid-size SLR camera.

Before getting through a in-depth comparison, below is a simple summary of how the 645D grades vs the K-3 II for portability, imaging, features and an overall mark.

Here is a preview of the gallery photos for Pentax 645D and Pentax K-3 II. The entire galleries are viewable at Pentax 645D Gallery and Pentax K-3 II Gallery.

For those who are planning to travel with your camera frequently, you'll have to think about its weight and proportions. The Pentax 645D features physical measurements of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") having a weight of 1480 grams (3.26 lbs) and the Pentax K-3 II has measurements of 131mm x 100mm x 77mm (5.2" x 3.9" x 3.0") with a weight of 800 grams (1.76 lbs).

Contrast the Pentax 645D and Pentax K-3 II in the new Camera with Lens Size Comparison Tool.

Take into consideration, the weight of an Interchangeable Lens Camera will vary based on the lens you use at the time. Following is the front view physical size comparison of the 645D compared to the K-3 II.

Looking at dimensions and weight, the portability rating of the 645D and K-3 II is 50 and 59 respectively.

Normally, it can be difficult to picture the contrast between sensor dimensions just by reviewing specs. The image underneath should give you a stronger sense of the sensor sizing in the 645D and K-3 II.

All in all, the two cameras enjoy different resolutions and different sensor dimensions. The 645D due to its bigger sensor is going to make shooting shallower depth of field simpler and the Pentax 645D will offer you greater detail due to its extra 16 Megapixels. Higher resolution will also enable you to crop photographs far more aggressively. The more aged 645D is going to be disadvantaged when it comes to sensor tech.