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-M1 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-M1 has external dimensions of 130 x 94 x 63 mm (5.13 x 3.68 x 2.48″) and weighs 497 g (1.10 lb / 17.53 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon P510 and the Olympus E-M1. Nikon P510 is 10mm narrower and 11mm shorter than Olympus E-M1 but it is also 39mm thicker. As you can tell, actually this is not a fair size comparison since Nikon P510 has a built-in lens but Olympus E-M1 doesn't. Once you put a lens on E-M1, its thickness will increase significantly.
Here is the back view size comparison of the Nikon P510 and Olympus E-M1.
Now lets look at the top view comparison of Nikon P510 and Olympus E-M1.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Olympus E-M1 is 58g lighter than the Nikon P510 but we don't think this will make a significant difference.
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-M1, the total kit will weigh much higher.
Weather Sealing
Thanks to the weather-sealed body of the E-M1, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the P510.
LCD Screen Size and Features
Nikon P510 and Olympus E-M1'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.