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 Sony NEX-3 and Pentax WG-10 side-by-side from the front, back and top in their relative dimensions. Sony NEX-3 has external dimensions of 117 x 62 x 33 mm (4.61 x 2.44 x 1.3″) and weighs 297 g (0.65 lb / 10.48 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 Sony NEX-3 and the Pentax WG-10. Pentax WG-10 is clearly the smaller of the two cameras. Its body is 1mm narrower, 3mm shorter and 4mm thinner than Sony NEX-3. As you can tell, actually this is not a fair size comparison since Pentax WG-10 has a built-in lens but Sony NEX-3 doesn't. Once you put a lens on NEX-3, its thickness will increase significantly.
Now lets look at the top view comparison of Sony NEX-3 and Pentax WG-10.
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 (130g ) than the Sony NEX-3 which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on NEX-3, the total kit will weigh much higher.
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 NEX-3.
LCD Screen Size and Features
Sony NEX-3's 3.00" LCD screen is slightly larger than Pentax WG-10's 2.7" screen.
In addition to the size advantage, Sony NEX-3 LCD screen also has a
Tilting feature where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels. On the other hand, Pentax WG-10 has a fixed type screen which provides less flexibility in shooting positions compared to NEX-3.