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 E-M10 II and Canon SD780 IS side-by-side from the front, back and top in their relative dimensions. Olympus E-M10 II has external dimensions of 120 x 83 x 47 mm (4.72 x 3.27 x 1.85″) and weighs 390 g (0.86 lb / 13.76 oz) (including batteries). Canon SD780 IS has external dimensions of 87 x 56 x 18 mm (3.43 x 2.2 x 0.71″) and weighs 155 g (0.34 lb / 5.47 oz) (including batteries).
Below you can see the front-view size comparison of the Olympus E-M10 II and the Canon SD780 IS. Canon SD780 IS is clearly the smaller of the two cameras. Its body is 33mm narrower, 27mm shorter and 29mm thinner than Olympus E-M10 II. As you can tell, actually this is not a fair size comparison since Canon SD780 IS has a built-in lens but Olympus E-M10 II doesn't. Once you put a lens on E-M10 II, its thickness will increase significantly.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon SD780 IS is significantly lighter (235g ) than the Olympus E-M10 II 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 E-M10 II, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Olympus OM-D E-M10 II nor Canon PowerShot SD780 IS (Digital IXUS 100 IS) 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 Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Olympus E-M10 II's 3.00" LCD screen is slightly larger than Canon SD780 IS's 2.5 screen.
In addition to the size advantage, Olympus E-M10 II 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 SD780 IS has a fixed type screen which provides less flexibility in shooting positions compared to E-M10 II.