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 Ricoh G900 and Sony a5100 side-by-side from the front, back and top in their relative dimensions. Ricoh G900 has external dimensions of 118 x 66 x 33 mm (4.65 x 2.6 x 1.3″) and weighs 247 g (0.54 lb / 8.71 oz) (including batteries). Sony a5100 has external dimensions of 110 x 63 x 36 mm (4.33 x 2.48 x 1.42″) and weighs 283 g (0.62 lb / 9.98 oz) (including batteries).
Below you can see the front-view size comparison of the Ricoh G900 and the Sony a5100. Sony a5100 is 8mm narrower and 3mm shorter than Ricoh G900 but it is also 3mm thicker. As you can tell, actually this is not a fair size comparison since Ricoh G900 has a built-in lens but Sony a5100 doesn't. Once you put a lens on a5100, its thickness will increase significantly.
Here is the back view size comparison of the Ricoh G900 and Sony a5100.
Now lets look at the top view comparison of Ricoh G900 and Sony a5100.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Ricoh G900 is 36g lighter than the Sony a5100 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 a5100, the total kit will weigh much higher.
Thanks to the weather-sealed body of the G900, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the a5100.
LCD Screen Size and Features
Ricoh G900 and Sony a5100's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Sony a5100 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 Ricoh G900 has a fixed type screen which provides less flexibility in shooting positions compared to a5100.