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 D80 and Olympus TG-820 iHS side-by-side from the front, back and top in their relative dimensions. Nikon D80 has external dimensions of 132 x 103 x 77 mm (5.2 x 4.06 x 3.03″) and weighs 668 g (1.47 lb / 23.56 oz) (including batteries). Olympus TG-820 iHS has external dimensions of 101 x 65 x 26 mm (3.98 x 2.56 x 1.02″) and weighs 206 g (0.45 lb / 7.27 oz) (including batteries).
Below you can see the front view size comparison of Nikon D80 and Olympus TG-820 iHS. Olympus TG-820 iHS is clearly the smaller of the two cameras. Its body is 31mm narrower, 38mm shorter and 51mm thinner than Nikon D80. As you can tell, actually this is not a fair size comparison since Olympus TG-820 iHS has a built-in lens but Nikon D80 doesn't. Once you put a lens on D80, its thickness will increase significantly.
Comparison image of Nikon D80 and Olympus TG-820 iHS Size, Weight and External Dimensions - Front View
Now lets look at the top view comparison of Nikon D80 and Olympus TG-820 iHS.
Top View Comparison image of Nikon D80 and Olympus TG-820 iHS Size
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Olympus TG-820 iHS is significantly lighter (462g ) than the Nikon D80 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 D80, the total kit will weigh much higher.
Weather Sealing
LCD Screen Size and Features
Olympus TG-820 iHS's 3" LCD screen is slightly larger than Nikon D80's 2.5" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.