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 1 J3 and Nikon P510 side-by-side from the front, back and top in their relative dimensions. Nikon 1 J3 has external dimensions of 101 x 61 x 29 mm (3.98 x 2.4 x 1.14″) and weighs 201 g (0.44 lb / 7.09 oz) (including batteries). 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).
Below you can see the front-view size comparison of the Nikon 1 J3 and the Nikon P510. Nikon 1 J3 is clearly the smaller of the two cameras. Its body is 19mm narrower, 22mm shorter and 73mm 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 Nikon 1 J3 doesn't. Once you put a lens on 1 J3, its thickness will increase significantly.
Now lets look at the top view comparison of Nikon 1 J3 and Nikon P510.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon 1 J3 is significantly lighter (354g ) 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 1 J3, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Nikon 1 J3 nor Nikon Coolpix P510 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 Bridge Cameras with Weather Sealing
LCD Screen Size and Features
Nikon 1 J3 and Nikon P510's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Nikon P510 features a
Tilting screen where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels whereas the Nikon 1 J3 has a fixed type screen which provides less flexibility in shooting positions compared to P510.