Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Panasonic ZS20 and Panasonic ZS50 side-by-side from the front, back and top in their relative dimensions. 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). 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 Panasonic ZS20 and Panasonic ZS50. Panasonic ZS20 is clearly the smaller of the two cameras. Its body is 6mm narrower, 6mm shorter and 6mm thinner than Panasonic ZS50.
Here is the back view size comparison of Panasonic ZS20 and Panasonic ZS50.
Now lets look at the top view comparison of Panasonic ZS20 and Panasonic ZS50.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Panasonic ZS20 is significantly lighter (37g ) than the Panasonic ZS50 which may become a big advantage especially on long walking trips.
Unfortunately neither Panasonic Lumix DMC-ZS20 (Lumix DMC-TZ30) nor Panasonic Lumix DMC-ZS50 (Lumix DMC-TZ70) provides any type of weather sealing in their body, 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
Panasonic ZS20 and Panasonic ZS50's LCD screens has the same diagonal size of 3.00".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.