Pentax K100D weighs 660 g (1.46 lb / 23.28 oz)
and has external dimensions of 129 x 93 x 70 mm (5.08 x 3.66 x 2.76″)
. Considering that the average weight of DSLR type cameras is 773g, its weight is about average in its class. With a thickness of 70mm, it also has an average thickness.
In order to give you a better idea about the real life size of Pentax K100D, we have added an image of how it looks next to a credit card and an AA type battery.
Below you can find the comparison of the weight and thickness of Pentax K100D with its main competitors:
Pentax K100D Size Compared to Main Competitors
Pentax K100D doesn't have any environmental sealings on its body so you got to be extra careful to protect it against water and dust. If you shoot under these conditions very often, consider checking Top DSLR Cameras with Weather Sealing page.