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 P300 and Olympus E-P3 side-by-side from the front, back and top in their relative dimensions. Nikon P300 has external dimensions of 103 x 58 x 32 mm (4.06 x 2.28 x 1.26″) and weighs 189 g (0.42 lb / 6.67 oz) (including batteries). Olympus E-P3 has external dimensions of 122 x 69 x 34 mm (4.8 x 2.72 x 1.34″) and weighs 369 g (0.81 lb / 13.02 oz) (including batteries).
Below you can see the front view size comparison of Nikon P300 and Olympus E-P3. Nikon P300 is clearly the smaller of the two cameras. Its body is 19mm narrower, 11mm shorter and 2mm thinner than Olympus E-P3. As you can tell, actually this is not a fair size comparison since Nikon P300 has a built-in lens but Olympus E-P3 doesn't. Once you put a lens on E-P3, its thickness will increase significantly.
![Nikon P300 vs Olympus E-P3 Camera Size Comparison - Front View]()
Comparison image of Nikon P300 and Olympus E-P3 Size, Weight and External Dimensions - Front View
Here is the back view size comparison of Nikon P300 and Olympus E-P3.
![Nikon P300 vs Olympus E-P3 Camera Size Comparison - Back View]()
Comparison image of Nikon P300 and Olympus E-P3 Size and Weight - Back View
Now lets look at the top view comparison of Nikon P300 and Olympus E-P3.
![Nikon P300 vs Olympus E-P3 Camera Size Comparison - Top View]()
Top View Comparison image of Nikon P300 and Olympus E-P3 Size
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon P300 is significantly lighter (180g ) than the Olympus E-P3 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 E-P3, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither Nikon Coolpix P300 nor Olympus PEN E-P3 provides any type of weather sealing in their body, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Compact Cameras with Weather Sealing Top Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Nikon P300 and Olympus E-P3's LCD screens has the same diagonal size of 3".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.