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 Nikon S8100 and Panasonic ZS8 side-by-side from the front, back and top in their relative dimensions. Nikon S8100 has external dimensions of 104 x 60 x 30 mm (4.09 x 2.36 x 1.18″) and weighs 180 g (0.40 lb / 6.35 oz) (including batteries). Panasonic ZS8 has external dimensions of 105 x 58 x 33 mm (4.13 x 2.28 x 1.3″) and weighs 210 g (0.46 lb / 7.41 oz) (including batteries).
Below you can see the front view size comparison of Nikon S8100 and Panasonic ZS8. Nikon S8100 is 1mm narrower and 3mm thinner than Panasonic ZS8 but it is also 2mm taller.
Here is the back view size comparison of Nikon S8100 and Panasonic ZS8.
Now lets look at the top view comparison of Nikon S8100 and Panasonic ZS8.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon S8100 is significantly lighter (30g ) than the Panasonic ZS8 which may become a big advantage especially on long walking trips.
Unfortunately neither Nikon Coolpix S8100 nor Panasonic Lumix DMC-ZS8 (Lumix DMC-TZ18) 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 S8100 and Panasonic ZS8'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.