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 Panasonic ZS3 and Pentax I-10 side-by-side from the front, back and top in their relative dimensions. Panasonic ZS3 has external dimensions of 103 x 60 x 33 mm (4.06 x 2.36 x 1.3″) and weighs 229 g (0.50 lb / 8.08 oz) (including batteries). Pentax I-10 has external dimensions of 101 x 65 x 28 mm (3.98 x 2.56 x 1.1″) and weighs 153 g (0.34 lb / 5.40 oz) (including batteries).
Below you can see the front view size comparison of Panasonic ZS3 and Pentax I-10. Pentax I-10 is 2mm narrower and 5mm thinner than Panasonic ZS3 but it is also 5mm taller.
Comparison image of Panasonic ZS3 and Pentax I-10 Size, Weight and External Dimensions - Front View
Here is the back view size comparison of Panasonic ZS3 and Pentax I-10.
Comparison image of Panasonic ZS3 and Pentax I-10 Size and Weight - Back View
Now lets look at the top view comparison of Panasonic ZS3 and Pentax I-10.
Top View Comparison image of Panasonic ZS3 and Pentax I-10 Size
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Pentax I-10 is significantly lighter (76g ) than the Panasonic ZS3 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither Panasonic Lumix DMC-ZS3 (Lumix DMC-TZ7) nor Pentax Optio I-10 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
Panasonic ZS3's 3" LCD screen is slightly larger than Pentax I-10's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.