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 ZS3 and Samsung ST100 side-by-side from the front, back and top in their relative dimensions. Panasonic ZS3 has external dimensions of 103 x 60 x 33 mm (4.06 x 2.36 x 1.3″) and weighs 229 g (0.50 lb / 8.08 oz) (including batteries). Samsung ST100 has external dimensions of 100 x 60 x 20 mm (3.94 x 2.36 x 0.79″) and weighs 155 g (0.34 lb / 5.47 oz) (including batteries).
Below you can see the front view size comparison of Panasonic ZS3 and Samsung ST100. Panasonic ZS3 has the same height with Samsung ST100. On the other hand, with a width of 103mm, it is 3 wider and also with a thickness of 33mm, it is 13mm thicker than Samsung ST100.
Here is the back view size comparison of Panasonic ZS3 and Samsung ST100.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Samsung ST100 is significantly lighter (74g ) than the Panasonic ZS3 which may become a big advantage especially on long walking trips.
Unfortunately neither Panasonic Lumix DMC-ZS3 (Lumix DMC-TZ7) nor Samsung ST100 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
Samsung ST100's 3.5" LCD screen is slightly larger than Panasonic ZS3's 3" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.