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 ZS7 and Pentax VS20 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). Pentax VS20 has external dimensions of 111 x 61 x 38 mm (4.37 x 2.4 x 1.5″) and weighs 235 g (0.52 lb / 8.29 oz) (including batteries).
Below you can see the front view size comparison of Panasonic ZS7 and Pentax VS20. Panasonic ZS7 is clearly the smaller of the two cameras. Its body is 8mm narrower, 1mm shorter and 5mm thinner than Pentax VS20.
Here is the back view size comparison of Panasonic ZS7 and Pentax VS20.
Now lets look at the top view comparison of Panasonic ZS7 and Pentax VS20.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Panasonic ZS7 is 17g lighter than the Pentax VS20 but we don't think this will make a significant difference.
Unfortunately neither Panasonic Lumix DMC-ZS7 (Lumix DMC-TZ10) nor Pentax Optio VS20 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 ZS7 and Pentax VS20'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.