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 Casio EX-ZR400 and Panasonic FX75 side-by-side from the front, back and top in their relative dimensions. Casio EX-ZR400 has external dimensions of 105 x 59 x 29 mm (4.13 x 2.32 x 1.14″) and weighs 205 g (0.45 lb / 7.23 oz) (including batteries). Panasonic FX75 has external dimensions of 103 x 55 x 23 mm (4.06 x 2.17 x 0.91″) and weighs 165 g (0.36 lb / 5.82 oz) (including batteries).
Below you can see the front-view size comparison of the Casio EX-ZR400 and the Panasonic FX75. Panasonic FX75 is clearly the smaller of the two cameras. Its body is 2mm narrower, 4mm shorter and 6mm thinner than Casio EX-ZR400.
Here is the back view size comparison of the Casio EX-ZR400 and Panasonic FX75.
Now lets look at the top view comparison of Casio EX-ZR400 and Panasonic FX75.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Panasonic FX75 is significantly lighter (40g ) than the Casio EX-ZR400 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Casio Exilim EX-ZR400 nor Panasonic Lumix DMC-FX75 (Lumix DMC-FX70) 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
Casio EX-ZR400's 3.00" LCD screen is slightly larger than Panasonic FX75's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.