Size and weight are big decision factors when you are trying to find the ideal camera for your needs.
In this section, we are going to illustrate the Olympus SP-820UZ and Pentax WG-10 side-by-side from the front, back and top in their relative dimensions. Olympus SP-820UZ has external dimensions of and weighs 485 g (1.07 lb / 17.11 oz) (including batteries). Pentax WG-10 has external dimensions of and weighs 167 g (including batteries).
Below you can see the front-view size comparison of the Olympus SP-820UZ and the Pentax WG-10. Pentax WG-10 is clearly the smaller of the two cameras. Its body is 1mm narrower, 19mm shorter and 64mm thinner than Olympus SP-820UZ.
Comparison image of the Olympus SP-820UZ and the Pentax WG-10 Size, Weight and External Dimensions - Front View
Now lets look at the top view comparison of Olympus SP-820UZ and Pentax WG-10.
Top View Comparison image of the Olympus SP-820UZ and the Pentax WG-10 Size
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Pentax WG-10 is significantly lighter (318g ) than the Olympus SP-820UZ which may become a big advantage especially on long walking trips.
Weather Sealing
Thanks to the weather-sealed body of the WG-10, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the SP-820UZ.
LCD Screen Size and Features
Olympus SP-820UZ's 3.00" LCD screen is slightly larger than Pentax WG-10's 2.7 screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.