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 D610 and Sony QX30 side-by-side from the front, back and top in their relative dimensions. Nikon D610 has external dimensions of 141 x 113 x 82 mm (5.55 x 4.45 x 3.23″) and weighs 850 g (1.87 lb / 29.98 oz) (including batteries). Sony QX30 has external dimensions of 68 x 65 x 58 mm (2.68 x 2.56 x 2.28″) and weighs 193 g (0.43 lb / 6.81 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon D610 and the Sony QX30. Sony QX30 is clearly the smaller of the two cameras. Its body is 73mm narrower, 48mm shorter and 24mm thinner than Nikon D610. As you can tell, actually this is not a fair size comparison since Sony QX30 has a built-in lens but Nikon D610 doesn't. Once you put a lens on D610, its thickness will increase significantly.
Now lets look at the top view comparison of Nikon D610 and Sony QX30.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony QX30 is significantly lighter (657g ) than the Nikon D610 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 D610, the total kit will weigh much higher.
Weather Sealing
With its weather-sealed body, we believe that the D610 has a big advantage over the QX30 which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Nikon D610's 3.20" LCD screen is slightly larger than Sony QX30's screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.