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 Olympus SZ-30MR and Casio EX-ZR15 side-by-side from the front, back and top in their relative dimensions. Olympus SZ-30MR has external dimensions of 106 x 69 x 40 mm (4.17 x 2.72 x 1.57″) and weighs 226 g (0.50 lb / 7.97 oz) (including batteries). Casio EX-ZR15 has external dimensions of 102 x 59 x 27 mm (4.02 x 2.32 x 1.06″) and weighs 176 g (0.39 lb / 6.21 oz) (including batteries).
Below you can see the front view size comparison of Olympus SZ-30MR and Casio EX-ZR15. Casio EX-ZR15 is clearly the smaller of the two cameras. Its body is 4mm narrower, 10mm shorter and 13mm thinner than Olympus SZ-30MR.
Now lets look at the top view comparison of Olympus SZ-30MR and Casio EX-ZR15.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Casio EX-ZR15 is significantly lighter (50g ) than the Olympus SZ-30MR which may become a big advantage especially on long walking trips.
Unfortunately neither Olympus SZ-30MR nor Casio Exilim EX-ZR15 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
Olympus SZ-30MR and Casio EX-ZR15'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.