Pentax 645D vs Pentax S1

Following is a thorough overview of the Pentax 645D and Pentax S1, one is a Pro DSLR and the latter is a Small Sensor Compact and both of them are built by Pentax. There is a sizeable difference between the sensor resolutions of the 645D (40MP) and S1 (14MP) and the 645D (Medium format) and S1 (1/2.3") boast totally different sensor sizing.

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The 645D was revealed 11 months prior to the S1 which means that they are of a similar generation. Both the cameras feature different body design with the Pentax 645D being a Large SLR camera and the Pentax S1 being a Compact camera.

Before going straight to a more detailed comparison, here is a short summary of how the 645D matches up versus the S1 for portability, imaging, features and an overall score.

Below is a preview of the gallery photos for Pentax 645D and Pentax Optio S1. The full galleries are available at Pentax 645D Gallery and Pentax S1 Gallery.

For anybody who is going to carry around your camera, you should think about its weight and volume. The Pentax 645D has physical dimensions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") and a weight of 1480 grams (3.26 lbs) whilst the Pentax S1 has sizing of 114mm x 58mm x 28mm (4.5" x 2.3" x 1.1") with a weight of 157 grams (0.35 lbs).

Analyze the Pentax 645D and Pentax S1 in the latest Camera with Lens Size Comparison Tool.

Do not forget, the weight of an Interchangeable Lens Camera will differ dependant on the lens you use at the time. Here is a front view physical size comparison of the 645D versus the S1.

Taking into consideration size and weight, the portability rating of the 645D and S1 is 50 and 93 respectively.

Usually, it is tough to envision the difference between sensor sizes purely by checking technical specs. The image underneath will offer you a better sense of the sensor sizes in the 645D and S1.

As you have seen, both cameras feature different resolutions and different sensor sizes. The 645D using its bigger sensor will make getting bokeh easier and the Pentax 645D will give more detail because of its extra 26 Megapixels. Higher resolution will help you crop pictures way more aggressively. The more aged 645D is going to be behind in sensor innovation.