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 Sigma DP2 Merrill 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). Sigma DP2 Merrill has external dimensions of 122 x 67 x 59 mm (4.8 x 2.64 x 2.32″) and weighs 330 g (0.73 lb / 11.64 oz) (including batteries).
Below you can see the front view size comparison of Olympus SZ-30MR and Sigma DP2 Merrill. Olympus SZ-30MR is 16mm narrower and 19mm thinner than Sigma DP2 Merrill but it is also 2mm taller.
Comparison image of Olympus SZ-30MR and Sigma DP2 Merrill Size, Weight and External Dimensions - Front View
Now lets look at the top view comparison of Olympus SZ-30MR and Sigma DP2 Merrill.
Top View Comparison image of Olympus SZ-30MR and Sigma DP2 Merrill Size
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Olympus SZ-30MR is significantly lighter (104g ) than the Sigma DP2 Merrill which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither Olympus SZ-30MR nor Sigma DP2 Merrill 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 Sigma DP2 Merrill'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.