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 S3 Pro and Fujifilm IS Pro side-by-side from the front, back and top in their relative dimensions. Fujifilm S3 Pro has external dimensions of 148 x 135 x 80 mm (5.83 x 5.31 x 3.15″) and weighs 930 g (2.05 lb / 32.80 oz) (including batteries). Fujifilm IS Pro has external dimensions of 147 x 113 x 74 mm (5.79 x 4.45 x 2.91″) and weighs 920 g (2.03 lb / 32.45 oz) (including batteries).
Below you can see the front-view size comparison of the Fujifilm S3 Pro and the Fujifilm IS Pro. Fujifilm IS Pro is clearly the smaller of the two cameras. Its body is 1mm narrower, 22mm shorter and 6mm thinner than Fujifilm S3 Pro.
Here is the back view size comparison of the Fujifilm S3 Pro and Fujifilm IS Pro.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Fujifilm IS Pro is 10g lighter than the Fujifilm S3 Pro but we don't think this will make a significant difference.
Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you also have to take into account the lenses that you will be using with these bodies. Since both Fujifilm S3 Pro and Fujifilm IS Pro have the same Nikon F lens mount and APS-C sized sensors, lenses will not be a differentiator on total size of the system.
Weather Sealing
With its weather-sealed body, we believe that the S3 Pro has a big advantage over the IS Pro which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Fujifilm IS Pro's 2.50" LCD screen is slightly larger than Fujifilm S3 Pro's 2" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.