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 LF1 and Nikon S640 side-by-side from the front, back and top in their relative dimensions. Panasonic LF1 has external dimensions of 103 x 62 x 28 mm (4.06 x 2.44 x 1.1″) and weighs 192 g (0.42 lb / 6.77 oz) (including batteries). Nikon S640 has external dimensions of 91 x 55 x 21 mm (3.58 x 2.17 x 0.83″) and weighs 130 g (0.29 lb / 4.59 oz) (including batteries).
Below you can see the front-view size comparison of the Panasonic LF1 and the Nikon S640. Nikon S640 is clearly the smaller of the two cameras. Its body is 12mm narrower, 7mm shorter and 7mm thinner than Panasonic LF1.
Here is the back view size comparison of the Panasonic LF1 and Nikon S640.
Now lets look at the top view comparison of Panasonic LF1 and Nikon S640.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon S640 is significantly lighter (62g ) than the Panasonic LF1 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Panasonic Lumix DMC-LF1 nor Nikon Coolpix S640 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 LF1's 3.00" LCD screen is slightly larger than Nikon S640's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.