Pentax K20D vs Sigma SD15

The following is a in depth comparison of the Pentax K20D and Sigma SD15, both Advanced DSLR digital cameras by brands Pentax and Sigma. There exists a sizeable gap between the resolutions of the K20D (15MP) and SD15 (5MP) but both cameras posses the same sensor measurements (APS-C).

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The K20D was manufactured 20 months before the SD15 which makes them a generation away from one another. The two cameras have the same body design (Mid-size SLR).

Before diving straight to a thorough comparison, here is a quick view of how the K20D matches up vs the SD15 in the way of portability, imaging, features and an overall mark.

Below is a preview of the gallery images for Pentax K20D and Sigma SD15. The entire galleries are viewable at Pentax K20D Gallery and Sigma SD15 Gallery.

In case you're planning to travel with your camera regularly, you will want to think about its weight and measurements. The Pentax K20D features external dimensions of 142mm x 101mm x 70mm (5.6" x 4.0" x 2.8") along with a weight of 800 grams (1.76 lbs) whilst the Sigma SD15 has proportions of 144mm x 107mm x 81mm (5.7" x 4.2" x 3.2") with a weight of 750 grams (1.65 lbs).

See the Pentax K20D and Sigma SD15 in the new Camera and Lens Size Comparison Tool.

Don't forget, the weight of an Interchangeable Lens Camera will vary depending on the lens you have at the time. Below is a front view sizing comparison of the K20D and the SD15.

Looking at dimensions and weight, the portability score of the K20D and SD15 is 59 and 59 respectively.

More often than not, it can be difficult to visualise the difference between sensor dimensions only by reading technical specs. The pic here might provide you a far better sense of the sensor sizes in the K20D and SD15.

As you have seen, each of the cameras have the same sensor dimensions albeit not the same megapixels. You should expect the Pentax K20D to deliver more detail due to its extra 10MP. Higher resolution can also allow you to crop pictures a bit more aggressively. The more aged K20D is going to be disadvantaged when it comes to sensor innovation.