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 Canon ELPH 150 IS and Sony A77 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 A77 has external dimensions of 143 x 104 x 81 mm (5.63 x 4.09 x 3.19″) and weighs 732 g (1.61 lb / 25.82 oz) (including batteries).
Below you can see the front-view size comparison of the Canon ELPH 150 IS and the Sony A77. Canon ELPH 150 IS is clearly the smaller of the two cameras. Its body is 48mm narrower, 47mm shorter and 57mm thinner than Sony A77. As you can tell, actually this is not a fair size comparison since Canon ELPH 150 IS has a built-in lens but Sony A77 doesn't. Once you put a lens on A77, its thickness will increase significantly.
Now lets look at the top view comparison of Canon ELPH 150 IS and Sony A77.
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 (590g ) than the Sony A77 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 A77, the total kit will weigh much higher.
Weather Sealing
Thanks to the weather-sealed body of the A77, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the ELPH 150 IS.
LCD Screen Size and Features
Sony A77's 3.00" LCD screen is slightly larger than Canon ELPH 150 IS's 2.7 screen.
Moreover, Sony A77 sports a
Fully Articulated screen which you can change the angle and position of the screen almost freely, making it possible to shoot from waist or over-the-head levels, and especially very useful for shooting selfies and video. On the other hand, Canon ELPH 150 IS has a fixed type screen which provides almost no flexibility in shooting positions compared to A77.