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 Fujifilm S8100fd and Nikon P7800 side-by-side from the front, back and top in their relative dimensions. Fujifilm S8100fd has external dimensions of 111 x 78 x 79 mm (4.38 x 3.08 x 3.12″) and weighs 405 g (0.89 lb / 14.29 oz) (including batteries). Nikon P7800 has external dimensions of 119 x 78 x 50 mm (4.69 x 3.07 x 1.97″) and weighs 399 g (0.88 lb / 14.07 oz) (including batteries).
Below you can see the front view size comparison of Fujifilm S8100fd and Nikon P7800.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon P7800 is 6g lighter than the Fujifilm S8100fd but we don't think this will make a significant difference.
Unfortunately neither Fujifilm FinePix S8100fd nor Nikon Coolpix P7800 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
LCD Screen Size and Features
Nikon P7800's 3" LCD screen is slightly larger than Fujifilm S8100fd's 2.5" screen.
Moreover, Nikon P7800 sports a Fully Articulated screen
which you can change the angle and position of the screen almost freely, making it possible to shoot from waist or over the head levels, and especially very useful for shooting selfies and video. On the other hand, Fujifilm S8100fd has a fixed type screen which provides almost no flexibility in shooting positions compared to P7800.