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 Sony W650 and Pentax MX-1 side-by-side from the front, back and top in their relative dimensions. Sony W650 has external dimensions of 94 x 56 x 19 mm (3.7 x 2.2 x 0.75″) and weighs 124 g (0.27 lb / 4.37 oz) (including batteries). Pentax MX-1 has external dimensions of 122 x 61 x 51 mm (4.8 x 2.4 x 2.01″) and weighs 391 g (0.86 lb / 13.79 oz) (including batteries).
Below you can see the front view size comparison of Sony W650 and Pentax MX-1. Sony W650 is clearly the smaller of the two cameras. Its body is 28mm narrower, 5mm shorter and 32mm thinner than Pentax MX-1.
Here is the back view size comparison of Sony W650 and Pentax MX-1.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Sony W650 is significantly lighter (267g ) than the Pentax MX-1 which may become a big advantage especially on long walking trips.
Unfortunately neither Sony Cyber-shot DSC-W650 nor Pentax MX-1 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
Sony W650 and Pentax MX-1's LCD screens has the same diagonal size of 3".
On the other hand, Pentax MX-1 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 Sony W650 has a fixed type screen which provides less flexibility in shooting positions compared to MX-1.