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 Pentax Q-S1 and Pentax Q7 side-by-side from the front, back and top in their relative dimensions. Pentax Q-S1 has external dimensions of 105 x 58 x 34 mm (4.13 x 2.28 x 1.34″) and weighs 203 g (0.45 lb / 7.16 oz) (including batteries). Pentax Q7 has external dimensions of 102 x 58 x 34 mm (4.02 x 2.28 x 1.34″) and weighs 200 g (0.44 lb / 7.05 oz) (including batteries).
Below you can see the front-view size comparison of the Pentax Q-S1 and the Pentax Q7.
Here is the back view size comparison of the Pentax Q-S1 and Pentax Q7.
Now lets look at the top view comparison of Pentax Q-S1 and Pentax Q7.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Pentax Q7 is 3g lighter than the Pentax Q-S1 but we don't think this will make a significant difference.
Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you also have to take into account the lenses that you will be using with these bodies. Since both Pentax Q-S1 and Pentax Q7 have the same Pentax Q lens mount and Small Sensor sized sensors, lenses will not be a differentiator on total size of the system.
Weather Sealing
Unfortunately neither the Pentax Q-S1 nor Pentax Q7 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 Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Pentax Q-S1 and Pentax Q7's LCD screens have the same diagonal size of 3.00 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.