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 Panasonic ZS7 and Sony W570 side-by-side from the front, back and top in their relative dimensions. 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). Sony W570 has external dimensions of 91 x 52 x 19 mm (3.58 x 2.05 x 0.75″) and weighs 116 g (0.26 lb / 4.09 oz) (including batteries).
Below you can see the front-view size comparison of the Panasonic ZS7 and the Sony W570. Sony W570 is clearly the smaller of the two cameras. Its body is 12mm narrower, 8mm shorter and 14mm thinner than Panasonic ZS7.
Here is the back view size comparison of the Panasonic ZS7 and Sony W570.
Now lets look at the top view comparison of Panasonic ZS7 and Sony W570.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony W570 is significantly lighter (102g ) than the Panasonic ZS7 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Panasonic Lumix DMC-ZS7 (Lumix DMC-TZ10) nor Sony Cyber-shot DSC-W570 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
Panasonic ZS7's 3.00" LCD screen is slightly larger than Sony W570's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.