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 Olympus TG-860 and Pentax Q-S1 side-by-side from the front, back and top in their relative dimensions. Olympus TG-860 has external dimensions of 110 x 64 x 28 mm (5.12 x 2.52 x 1.1″) and weighs 224 g (0.49 lb / 7.90 oz) (including batteries). 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).
Below you can see the front-view size comparison of the Olympus TG-860 and the Pentax Q-S1. Pentax Q-S1 is 5mm narrower and 6mm shorter than Olympus TG-860 but it is also 6mm thicker. As you can tell, actually this is not a fair size comparison since Olympus TG-860 has a built-in lens but Pentax Q-S1 doesn't. Once you put a lens on Q-S1, its thickness will increase significantly.
Here is the back view size comparison of the Olympus TG-860 and Pentax Q-S1.
Now lets look at the top view comparison of Olympus TG-860 and Pentax Q-S1.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Pentax Q-S1 is 21g lighter than the Olympus TG-860 but we don't think this will make a significant difference.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on Q-S1, the total kit will weigh much higher.
Weather Sealing
Thanks to the weather-sealed body of the TG-860, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the Q-S1.
LCD Screen Size and Features
Olympus TG-860 and Pentax Q-S1's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Olympus TG-860 features a
Tilting screen where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels whereas the Pentax Q-S1 has a fixed type screen which provides less flexibility in shooting positions compared to TG-860.