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 Fujifilm S9900w and Nikon D5100 side-by-side from the front, back and top in their relative dimensions. Fujifilm S9900w has external dimensions of 123 x 87 x 116 mm (4.84 x 3.43 x 4.57″) and weighs 670 g (1.48 lb / 23.63 oz) (including batteries). Nikon D5100 has external dimensions of 128 x 97 x 79 mm (5.04 x 3.82 x 3.11″) and weighs 560 g (1.23 lb / 19.75 oz) (including batteries).
Below you can see the front-view size comparison of the Fujifilm S9900w and the Nikon D5100. Fujifilm S9900w is 5mm narrower and 10mm shorter than Nikon D5100 but it is also 37mm thicker. As you can tell, actually this is not a fair size comparison since Fujifilm S9900w has a built-in lens but Nikon D5100 doesn't. Once you put a lens on D5100, its thickness will increase significantly.
Here is the back view size comparison of the Fujifilm S9900w and Nikon D5100.
Now lets look at the top view comparison of Fujifilm S9900w and Nikon D5100.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon D5100 is significantly lighter (110g ) than the Fujifilm S9900w 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 D5100, the total kit will weigh much higher.
Unfortunately neither the Fujifilm S9900w nor Nikon D5100 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 Bridge Cameras with Weather Sealing Top DSLR Cameras with Weather Sealing
LCD Screen Size and Features
Fujifilm S9900w and Nikon D5100's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Nikon D5100 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. Fujifilm S9900w's LCD screen is a fixed type which provides almost no flexibility in shooting positions compared to D5100.