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-FC100 and Olympus VH-515 side-by-side from the front, back and top in their relative dimensions. Casio EX-FC100 has external dimensions of 100 x 59 x 23 mm (3.94 x 2.32 x 0.91″) and weighs 156 g (0.34 lb / 5.50 oz) (including batteries). Olympus VH-515 has external dimensions of 102 x 60 x 21 mm (4.02 x 2.36 x 0.83″) and weighs 152 g (0.34 lb / 5.36 oz) (including batteries).
Below you can see the front view size comparison of Casio EX-FC100 and Olympus VH-515. Casio EX-FC100 is 2mm narrower and 1mm shorter than Olympus VH-515 but it is also 2mm thicker.
Comparison image of Casio EX-FC100 and Olympus VH-515 Size, Weight and External Dimensions - Front View
Here is the back view size comparison of Casio EX-FC100 and Olympus VH-515.
Comparison image of Casio EX-FC100 and Olympus VH-515 Size and Weight - Back View
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Olympus VH-515 is 4g lighter than the Casio EX-FC100 but we don't think this will make a significant difference.
Weather Sealing
Unfortunately neither Casio Exilim EX-FC100 nor Olympus VH-515 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 VH-515's 3" LCD screen is slightly larger than Casio EX-FC100's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.