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 SZ-30MR and Panasonic ZS20 side-by-side from the front, back and top in their relative dimensions. Olympus SZ-30MR has external dimensions of 106 x 69 x 40 mm (4.17 x 2.72 x 1.57″) and weighs 226 g (0.50 lb / 7.97 oz) (including batteries). Panasonic ZS20 has external dimensions of 105 x 59 x 28 mm (4.13 x 2.32 x 1.1″) and weighs 206 g (0.45 lb / 7.27 oz) (including batteries).
Below you can see the front-view size comparison of the Olympus SZ-30MR and the Panasonic ZS20. Panasonic ZS20 is clearly the smaller of the two cameras. Its body is 1mm narrower, 10mm shorter and 12mm thinner than Olympus SZ-30MR.
Now lets look at the top view comparison of Olympus SZ-30MR and Panasonic ZS20.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Panasonic ZS20 is 20g lighter than the Olympus SZ-30MR but we don't think this will make a significant difference.
Weather Sealing
Unfortunately neither the Olympus SZ-30MR nor Panasonic Lumix DMC-ZS20 (Lumix DMC-TZ30) 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 SZ-30MR and Panasonic ZS20'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.