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 Samsung Galaxy NX and Sony A3000 side-by-side from the front, back and top in their relative dimensions. Samsung Galaxy NX has external dimensions of 137 x 101 x 26 mm (5.39 x 3.98 x 1.02″) and weighs 495 g (1.09 lb / 17.46 oz) (including batteries). Sony A3000 has external dimensions of 128 x 91 x 85 mm (5.04 x 3.58 x 3.35″) and weighs 411 g (0.91 lb / 14.50 oz) (including batteries).
Below you can see the front-view size comparison of the Samsung Galaxy NX and the Sony A3000. Sony A3000 is 9mm narrower and 10mm shorter than Samsung Galaxy NX but it is also 59mm thicker.
Comparison image of the Samsung Galaxy NX and the Sony A3000 Size, Weight and External Dimensions - Front View
Here is the back view size comparison of the Samsung Galaxy NX and Sony A3000.
Comparison image of the Samsung Galaxy NX and the Sony A3000 Size and Weight - Back View
Now lets look at the top view comparison of Samsung Galaxy NX and Sony A3000.
Top View Comparison image of the Samsung Galaxy NX and the Sony A3000 Size
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony A3000 is significantly lighter (84g ) than the Samsung Galaxy NX which may become a big advantage especially on long walking trips.
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 Samsung Galaxy NX and Sony A3000 have the same APS-C sized sensor, their lenses for a similar focal length and aperture will be similar in size and weight.
Weather Sealing
Unfortunately neither the Samsung Galaxy NX nor Sony Alpha A3000 provides any type of weather sealing in their bodies, 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 Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Samsung Galaxy NX's 4.80" LCD screen is slightly larger than Sony A3000's 3 screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.