Size and weight are big decision factors when you are trying to find the ideal camera for your needs.
In this section, we are going to illustrate the Panasonic ZS3 and Pentax X90 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 X90 has external dimensions of 111 x 85 x 110 mm (4.37 x 3.35 x 4.33″) and weighs 428 g (0.94 lb / 15.10 oz) (including batteries).
Below you can see the front-view size comparison of the Panasonic ZS3 and the Pentax X90. Panasonic ZS3 is clearly the smaller of the two cameras. Its body is 8mm narrower, 25mm shorter and 77mm thinner than Pentax X90.
Here is the back view size comparison of the Panasonic ZS3 and Pentax X90.
Now lets look at the top view comparison of Panasonic ZS3 and Pentax X90.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Panasonic ZS3 is significantly lighter (199g ) than the Pentax X90 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Panasonic Lumix DMC-ZS3 (Lumix DMC-TZ7) nor Pentax X90 provides any type of weather sealing in their bodies, 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 Top Bridge Cameras with Weather Sealing
LCD Screen Size and Features
Panasonic ZS3's 3.00" LCD screen is slightly larger than Pentax X90's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.