Pentax 645D vs Pentax K-S1

Lets look more closely at the Pentax 645D vs Pentax K-S1, one is a Pro DSLR and the latter is a Advanced DSLR and both are manufactured by Pentax. There is a big difference between the sensor resolutions of the 645D (40MP) and K-S1 (20MP) and the 645D (Medium format) and K-S1 (APS-C) offer different sensor sizing.

Photography Glossary

The 645D was released 5 years before the K-S1 which is quite a big gap as far as tech is concerned. Each of these cameras have different body design with the Pentax 645D being a Large SLR camera and the Pentax K-S1 being a Mid-size SLR camera.

Before we go straight to a more detailed comparison, here is a simple synopsis of how the 645D grades against the K-S1 for portability, imaging, features and an overall mark.

Here is a preview of the gallery photos for Pentax 645D and Pentax K-S1. The complete galleries are viewable at Pentax 645D Gallery and Pentax K-S1 Gallery.

For anybody who is planning to travel with your camera, you need to think about its weight and proportions. The Pentax 645D provides exterior dimensions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") having a weight of 1480 grams (3.26 lbs) while the Pentax K-S1 has measurements of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") having a weight of 558 grams (1.23 lbs).

Check out the Pentax 645D vs Pentax K-S1 in the new Camera with Lens Size Comparison Tool.

Remember that, the weight of an Interchangeable Lens Camera will vary based on the lens you use at that moment. Following is a front view measurements comparison of the 645D and the K-S1.

Looking at size and weight, the portability score of the 645D and K-S1 is 50 and 69 respectively.

Generally, it's hard to imagine the gap between sensor dimensions just by going over technical specs. The image underneath will help offer you a better sense of the sensor sizes in the 645D and K-S1.

As you have seen, both of the cameras provide different megapixels and different sensor dimensions. The 645D featuring a bigger sensor is going to make getting bokeh simpler and the Pentax 645D will deliver extra detail as a result of its extra 20MP. Higher resolution will enable you to crop photographs more aggressively. The more aged 645D is going to be disadvantaged with regard to sensor tech.