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 Panasonic ZS7 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). Panasonic ZS7 has external dimensions of 103 x 60 x 33 mm (4.06 x 2.36 x 1.3″) and weighs 218 g (0.48 lb / 7.69 oz) (including batteries).
Below you can see the front view size comparison of Panasonic ZS3 and Panasonic ZS7. In this case, we can see that Panasonic ZS3 and Panasonic ZS7 have the exact same height, width and thickness.
Here is the back view size comparison of Panasonic ZS3 and Panasonic ZS7.
Now lets look at the top view comparison of Panasonic ZS3 and Panasonic ZS7.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Panasonic ZS7 is 11g lighter than the Panasonic ZS3 but we don't think this will make a significant difference.
Unfortunately neither Panasonic Lumix DMC-ZS3 (Lumix DMC-TZ7) nor Panasonic Lumix DMC-ZS7 (Lumix DMC-TZ10) 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 ZS3 and Panasonic ZS7's LCD screens has the same diagonal size of 3".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.