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 Nikon D700 and Olympus TG-3 side-by-side from the front, back and top in their relative dimensions. Nikon D700 has external dimensions of 147 x 123 x 77 mm (5.79 x 4.84 x 3.03″) and weighs 1074 g (2.37 lb / 37.88 oz) (including batteries). Olympus TG-3 has external dimensions of 112 x 66 x 31 mm (4.41 x 2.6 x 1.22″) and weighs 247 g (0.54 lb / 8.71 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon D700 and the Olympus TG-3. Olympus TG-3 is clearly the smaller of the two cameras. Its body is 35mm narrower, 57mm shorter and 46mm thinner than Nikon D700. As you can tell, actually this is not a fair size comparison since Olympus TG-3 has a built-in lens but Nikon D700 doesn't. Once you put a lens on D700, its thickness will increase significantly.
Here is the back view size comparison of the Nikon D700 and Olympus TG-3.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Olympus TG-3 is significantly lighter (827g ) than the Nikon D700 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 D700, the total kit will weigh much higher.
Weather Sealing
LCD Screen Size and Features
Nikon D700 and Olympus TG-3'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.