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 Nikon S100 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). Nikon S100 has external dimensions of 99 x 65 x 18 mm (3.9 x 2.56 x 0.71″) and weighs 175 g (0.39 lb / 6.17 oz) (including batteries).
Below you can see the front view size comparison of Panasonic ZS7 and Nikon S100. Nikon S100 is 4mm narrower and 15mm thinner than Panasonic ZS7 but it is also 5mm taller.
Here is the back view size comparison of Panasonic ZS7 and Nikon S100.
Now lets look at the top view comparison of Panasonic ZS7 and Nikon S100.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon S100 is significantly lighter (43g ) than the Panasonic ZS7 which may become a big advantage especially on long walking trips.
Unfortunately neither Panasonic Lumix DMC-ZS7 (Lumix DMC-TZ10) nor Nikon Coolpix S100 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
Nikon S100's 3.5" LCD screen is slightly larger than Panasonic ZS7's 3" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.