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 Olympus TG-2 iHS and Nikon D90 side-by-side from the front, back and top in their relative dimensions. Olympus TG-2 iHS has external dimensions of 111 x 67 x 29 mm (4.37 x 2.64 x 1.14″) and weighs 230 g (0.51 lb / 8.11 oz) (including batteries). Nikon D90 has external dimensions of 132 x 103 x 77 mm (5.2 x 4.06 x 3.03″) and weighs 703 g (1.55 lb / 24.80 oz) (including batteries).
Below you can see the front-view size comparison of the Olympus TG-2 iHS and the Nikon D90. Olympus TG-2 iHS is clearly the smaller of the two cameras. Its body is 21mm narrower, 36mm shorter and 48mm thinner than Nikon D90. As you can tell, actually this is not a fair size comparison since Olympus TG-2 iHS has a built-in lens but Nikon D90 doesn't. Once you put a lens on D90, its thickness will increase significantly.
Here is the back view size comparison of the Olympus TG-2 iHS and Nikon D90.
Now lets look at the top view comparison of Olympus TG-2 iHS and Nikon D90.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Olympus TG-2 iHS is significantly lighter (473g ) than the Nikon D90 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 D90, the total kit will weigh much higher.
Weather Sealing
With its weather-sealed body, we believe that the TG-2 iHS has a big advantage over the D90 which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Olympus TG-2 iHS and Nikon D90's LCD screens have the same diagonal size of 3.00 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.