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 Panasonic ZS50 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). Panasonic ZS50 has external dimensions of 111 x 65 x 34 mm (4.37 x 2.56 x 1.34″) and weighs 243 g (0.54 lb / 8.57 oz) (including batteries).
Below you can see the front-view size comparison of the Olympus SP-820UZ and the Panasonic ZS50. Panasonic ZS50 is clearly the smaller of the two cameras. Its body is 6mm narrower, 13mm shorter and 59mm thinner than Olympus SP-820UZ.
Now lets look at the top view comparison of Olympus SP-820UZ and Panasonic ZS50.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Panasonic ZS50 is significantly lighter (242g ) than the Olympus SP-820UZ which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Olympus Stylus SP-820UZ nor Panasonic Lumix DMC-ZS50 (Lumix DMC-TZ70) provides any type of weather sealing in their bodies, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Olympus SP-820UZ and Panasonic ZS50's LCD screens have the same diagonal size of 3.00 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.