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 Sony A7 III and Samsung NX300M side-by-side from the front, back and top in their relative dimensions. Sony A7 III has external dimensions of 127 x 96 x 74 mm (5 x 3.78 x 2.91″) and weighs 650 g (1.43 lb / 22.93 oz) (including batteries). Samsung NX300M has external dimensions of 122 x 64 x 41 mm (4.8 x 2.52 x 1.61″) and weighs 331 g (0.73 lb / 11.68 oz) (including batteries).
Below you can see the front-view size comparison of the Sony A7 III and the Samsung NX300M. Samsung NX300M is clearly the smaller of the two cameras. Its body is 5mm narrower, 32mm shorter and 33mm thinner than Sony A7 III.
Now lets look at the top view comparison of Sony A7 III and Samsung NX300M.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Samsung NX300M is significantly lighter (319g ) than the Sony A7 III 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 Sony A7 III has a Full frame sensor and Samsung NX300M has a smaller APS-C sensor, Samsung NX300M's lenses for a similar focal length and aperture will generally be lighter and smaller than the Sony A7 III lenses.
Weather Sealing
With its weather-sealed body, we believe that the A7 III has a big advantage over the NX300M which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Samsung NX300M's 3.30" LCD screen is slightly larger than Sony A7 III's 3″ screen.