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 H300 and Sony A580 side-by-side from the front, back and top in their relative dimensions. Sony H300 has external dimensions of 130 x 95 x 122 mm (5.1 x 3.74 x 4.81″) and weighs 590 g (1.30 lb / 20.81 oz) (including batteries). Sony A580 has external dimensions of 137 x 104 x 84 mm (5.39 x 4.09 x 3.31″) and weighs 599 g (1.32 lb / 21.13 oz) (including batteries).
Below you can see the front-view size comparison of the Sony H300 and the Sony A580. Sony H300 is 7mm narrower and 9mm shorter than Sony A580 but it is also 38mm thicker. As you can tell, actually this is not a fair size comparison since Sony H300 has a built-in lens but Sony A580 doesn't. Once you put a lens on A580, its thickness will increase significantly.
Here is the back view size comparison of the Sony H300 and Sony A580.
Now lets look at the top view comparison of Sony H300 and Sony A580.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony H300 is 9g lighter than the Sony A580 but we don't think this will make a significant difference.
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 A580, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Sony Cyber-shot DSC-H300 nor Sony Alpha DSLR-A580 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 Bridge Cameras with Weather Sealing Top DSLR Cameras with Weather Sealing
LCD Screen Size and Features
Sony H300 and Sony A580's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Sony A580 features a
Tilting screen where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels whereas the Sony H300 has a fixed type screen which provides less flexibility in shooting positions compared to A580.