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 Casio EX-Z450 and Ricoh GR Digital IV side-by-side from the front, back and top in their relative dimensions. Casio EX-Z450 has external dimensions of 81 x 56 x 21 mm (3.19 x 2.2 x 0.83″) and weighs 128 g (0.28 lb / 4.52 oz) (including batteries). Ricoh GR Digital IV has external dimensions of 109 x 59 x 33 mm (4.29 x 2.32 x 1.3″) and weighs 190 g (0.42 lb / 6.70 oz) (including batteries).
Below you can see the front view size comparison of Casio EX-Z450 and Ricoh GR Digital IV. Casio EX-Z450 is clearly the smaller of the two cameras. Its body is 28mm narrower, 3mm shorter and 12mm thinner than Ricoh GR Digital IV.
Here is the back view size comparison of Casio EX-Z450 and Ricoh GR Digital IV.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Casio EX-Z450 is significantly lighter (62g ) than the Ricoh GR Digital IV which may become a big advantage especially on long walking trips.
Unfortunately neither Casio Exilim EX-Z450 nor Ricoh GR Digital IV 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
Casio EX-Z450 and Ricoh GR Digital IV'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.