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 Panasonic G9 and Nikon P510 side-by-side from the front, back and top in their relative dimensions. Panasonic G9 has external dimensions of 137 x 97 x 92 mm (5.39 x 3.82 x 3.62″) and weighs 658 g (1.45 lb / 23.21 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 Panasonic G9 and Nikon P510. Nikon P510 is 17mm narrower and 14mm shorter than Panasonic G9 but it is also 10mm thicker. As you can tell, actually this is not a fair size comparison since Nikon P510 has a built-in lens but Panasonic G9 doesn't. Once you put a lens on G9, its thickness will increase significantly.
Here is the back view size comparison of Panasonic G9 and Nikon P510.
Now lets look at the top view comparison of Panasonic G9 and Nikon P510.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon P510 is significantly lighter (103g ) than the Panasonic G9 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 G9, the total kit will weigh much higher.
With its weather sealed body, we believe that G9 has a big advantage over P510 which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Panasonic G9 and Nikon P510's LCD screens has the same diagonal size of 3.00".
Nikon P510 features a Tilting only screen
which is mostly only good for shooting from waist or over the head levels. On the other hand, Panasonic G9 sports a Fully Articulated screen
which is more flexible and useful especially for taking Selfie shots and video.