Sony A390 weighs
549 g (1.21 lb / 19.37 oz) and has external dimensions of
128 x 97 x 86 mm (5.04 x 3.82 x 3.39″). Considering that the average weight of DSLR type cameras is 773g, Sony A390 is a remarkably light camera for its class. With a thickness of 86mm, it has an average thickness for its class.
Weight Comparison
DSLR Cameras
Thickness Comparison
DSLR Cameras
Here is the front and top view image of Sony A390 with the dimensions:
Front and Top View External Dimensions and Size of Sony A390 Camera Body
In order to give you a better idea about the real life size of Sony A390, we have added an image of how it looks next to a credit card and an AA type battery.
Physical size of the Sony A390 Body Compared to a Credit Card and an AA Battery
Now let's compare Sony A390 size with the camera that it replaced: Sony A380. Sony A390 has the same height and width with Sony A380. On the other hand, with a thickness of 86mm, it is 15mm thicker.
Comparison image of Sony A390 and Sony A380 Size, Weight and External Dimensions - Front View
Below you can find the comparison of the weight and thickness of Sony A390 with its main competitors:
Sony A390 Size Compared to Main Competitors
Weather Sealing
Sony A390 doesn't have any environmental sealings on its body so you got to be extra careful to protect it against water and dust. If you shoot under these conditions very often, consider checking Top DSLR Cameras with Weather Sealing page.