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 E-P3 and Ricoh WG-50 side-by-side from the front, back and top in their relative dimensions. Olympus E-P3 has external dimensions of 122 x 69 x 34 mm (4.8 x 2.72 x 1.34″) and weighs 369 g (0.81 lb / 13.02 oz) (including batteries). Ricoh WG-50 has external dimensions of 123 x 62 x 30 mm (4.84 x 2.44 x 1.18″) and weighs 193 g (0.43 lb / 6.81 oz) (including batteries).
Below you can see the front-view size comparison of the Olympus E-P3 and the Ricoh WG-50. Ricoh WG-50 is 7mm shorter and 4mm thinner than Olympus E-P3 but it is also 1mm wider. As you can tell, actually this is not a fair size comparison since Ricoh WG-50 has a built-in lens but Olympus E-P3 doesn't. Once you put a lens on E-P3, its thickness will increase significantly.
Here is the back view size comparison of the Olympus E-P3 and Ricoh WG-50.
Now lets look at the top view comparison of Olympus E-P3 and Ricoh WG-50.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Ricoh WG-50 is significantly lighter (176g ) than the Olympus E-P3 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 E-P3, the total kit will weigh much higher.
Weather Sealing
Thanks to the weather-sealed body of the WG-50, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the E-P3.
LCD Screen Size and Features
Olympus E-P3's 3.00" LCD screen is slightly larger than Ricoh WG-50's 2.7 screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.