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 Nikon P510 and Olympus E-M10 side-by-side from the front, back and top in their relative dimensions. Nikon P510 has external dimensions of 120 x 83 x 102 mm (4.72 x 3.27 x 4.02″) and weighs 555 g (1.22 lb / 19.58 oz) (including batteries). Olympus E-M10 has external dimensions of 119 x 82 x 46 mm (4.69 x 3.24 x 1.81″) and weighs 396 g (0.87 lb / 13.97 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon P510 and the Olympus E-M10. Olympus E-M10 is clearly the smaller of the two cameras. Its body is 1mm narrower, 1mm shorter and 56mm thinner than Nikon P510. As you can tell, actually this is not a fair size comparison since Nikon P510 has a built-in lens but Olympus E-M10 doesn't. Once you put a lens on E-M10, its thickness will increase significantly.
Here is the back view size comparison of the Nikon P510 and Olympus E-M10.
Now lets look at the top view comparison of Nikon P510 and Olympus E-M10.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Olympus E-M10 is significantly lighter (159g ) than the Nikon P510 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, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Nikon Coolpix P510 nor Olympus OM-D E-M10 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 Bridge Cameras with Weather Sealing Top Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Nikon P510 and Olympus E-M10's LCD screens have the same diagonal size of 3.00 inches.
Both cameras feature
Tilting screens where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels.