Pentax K-3 III weighs 820 g (1.81 lb / 28.92 oz) and has external dimensions of 135 x 104 x 74 mm (5.31 x 4.09 x 2.91″). Considering that the average weight of DSLR type cameras is 773g, its weight is about average in its class. With a thickness of 74mm, it also has an average thickness.
Here is the front and top view image of Pentax K-3 III with the dimensions:
In order to give you a better idea about the real life size of Pentax K-3 III, we have added an image of how it looks next to a credit card and an AA type battery.
Now let's compare Pentax K-3 III size with the camera that it replaced: Pentax K-3 II. Pentax K-3 II is 4mm narrower and 4mm shorter than Pentax K-3 III but it is also 3mm thicker.
Below you can find the comparison of the weight and thickness of Pentax K-3 III with its main competitors:
Pentax K-3 III has environmental sealings on its body which makes it a weather resistant camera, providing resistance against the water and dust getting in to the camera. If you like outdoors photography and want to be able to use your camera in extreme conditions, Pentax K-3 III will serve you well. If you attach one of these Pentax K-3 III weather Sealed lenses to your camera, you will have a great all weather kit.