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 Ricoh GR Digital IV and Panasonic ZS8 side-by-side from the front, back and top in their relative dimensions. 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). Panasonic ZS8 has external dimensions of 105 x 58 x 33 mm (4.13 x 2.28 x 1.3″) and weighs 210 g (0.46 lb / 7.41 oz) (including batteries).
Below you can see the front view size comparison of Ricoh GR Digital IV and Panasonic ZS8. Panasonic ZS8 is 4mm narrower and 1mm shorter than Ricoh GR Digital IV but they have the same thickness of 33mm.
Here is the back view size comparison of Ricoh GR Digital IV and Panasonic ZS8.
Now lets look at the top view comparison of Ricoh GR Digital IV and Panasonic ZS8.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Ricoh GR Digital IV is 20g lighter than the Panasonic ZS8 but we don't think this will make a significant difference.
Unfortunately neither Ricoh GR Digital IV nor Panasonic Lumix DMC-ZS8 (Lumix DMC-TZ18) 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
Ricoh GR Digital IV and Panasonic ZS8'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.