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 Canon ELPH 150 IS and Sony NEX-7 side-by-side from the front, back and top in their relative dimensions. Canon ELPH 150 IS has external dimensions of 95 x 57 x 24 mm (3.74 x 2.24 x 0.94″) and weighs 142 g (0.31 lb / 5.01 oz) (including batteries). Sony NEX-7 has external dimensions of 120 x 67 x 43 mm (4.72 x 2.64 x 1.69″) and weighs 400 g (0.88 lb / 14.11 oz) (including batteries).
Below you can see the front view size comparison of Canon ELPH 150 IS and Sony NEX-7. Canon ELPH 150 IS is clearly the smaller of the two cameras. Its body is 25mm narrower, 10mm shorter and 19mm thinner than Sony NEX-7. As you can tell, actually this is not a fair size comparison since Canon ELPH 150 IS has a built-in lens but Sony NEX-7 doesn't. Once you put a lens on NEX-7, its thickness will increase significantly.
Here is the back view size comparison of Canon ELPH 150 IS and Sony NEX-7.
Now lets look at the top view comparison of Canon ELPH 150 IS and Sony NEX-7.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon ELPH 150 IS is significantly lighter (258g ) than the Sony NEX-7 which may become a big advantage especially on long walking trips.
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 NEX-7, the total kit will weigh much higher.
Unfortunately neither Canon PowerShot ELPH 150 IS (IXUS 155) nor Sony Alpha NEX-7 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 Top Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Sony NEX-7's 3.00" LCD screen is slightly larger than Canon ELPH 150 IS's 2.7" screen.
In addition to the size advantage, Sony NEX-7 LCD screen also has a Tilting feature
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels. On the other hand, Canon ELPH 150 IS has a fixed type screen which provides less flexibility in shooting positions compared to NEX-7.