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 S9100 and Nikon Df side-by-side from the front, back and top in their relative dimensions. Nikon S9100 has external dimensions of 105 x 62 x 35 mm (4.13 x 2.44 x 1.38″) and weighs 214 g (0.47 lb / 7.55 oz) (including batteries). Nikon Df has external dimensions of 144 x 110 x 67 mm (5.67 x 4.33 x 2.64″) and weighs 760 g (1.68 lb / 26.81 oz) (including batteries).
Below you can see the front view size comparison of Nikon S9100 and Nikon Df. Nikon S9100 is clearly the smaller of the two cameras. Its body is 39mm narrower, 48mm shorter and 32mm thinner than Nikon Df. As you can tell, actually this is not a fair size comparison since Nikon S9100 has a built-in lens but Nikon Df doesn't. Once you put a lens on Df, its thickness will increase significantly.
Here is the back view size comparison of Nikon S9100 and Nikon Df.
Now lets look at the top view comparison of Nikon S9100 and Nikon Df.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon S9100 is significantly lighter (546g ) than the Nikon Df 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 Df, the total kit will weigh much higher.
Thanks to the weather sealed body of Df, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to S9100.
LCD Screen Size and Features
Nikon Df's 3.2" LCD screen is slightly larger than Nikon S9100's 3" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.