Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Nikon P300 and Nikon P510 side-by-side from the front, back and top in their relative dimensions. Nikon P300 has external dimensions of 103 x 58 x 32 mm (4.06 x 2.28 x 1.26″) and weighs 189 g (0.42 lb / 6.67 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 Nikon P300 and Nikon P510. Nikon P300 is clearly the smaller of the two cameras. Its body is 17mm narrower, 25mm shorter and 70mm thinner than Nikon P510.
Here is the back view size comparison of Nikon P300 and Nikon P510.
Now lets look at the top view comparison of Nikon P300 and Nikon P510.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon P300 is significantly lighter (366g ) than the Nikon P510 which may become a big advantage especially on long walking trips.
Unfortunately neither Nikon Coolpix P300 nor Nikon Coolpix P510 provides any type of weather sealing in their body, 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 Compact Cameras with Weather Sealing Top Bridge Cameras with Weather Sealing
LCD Screen Size and Features
Nikon P300 and Nikon P510's LCD screens has the same diagonal size of 3.00".
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 P300 has a fixed type screen which provides less flexibility in shooting positions compared to P510.