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 Canon 500D and Olympus 7010 side-by-side from the front, back and top in their relative dimensions. Canon 500D has external dimensions of 129 x 98 x 62 mm (5.08 x 3.86 x 2.44″) and weighs 520 g (1.15 lb / 18.34 oz) (including batteries). Olympus 7010 has external dimensions of 98 x 56 x 26 mm (3.86 x 2.2 x 1.02″) and weighs 145 g (0.32 lb / 5.11 oz) (including batteries).
Below you can see the front-view size comparison of the Canon 500D and the Olympus 7010. Olympus 7010 is clearly the smaller of the two cameras. Its body is 31mm narrower, 42mm shorter and 36mm thinner than Canon 500D. As you can tell, actually this is not a fair size comparison since Olympus 7010 has a built-in lens but Canon 500D doesn't. Once you put a lens on 500D, its thickness will increase significantly.
Here is the back view size comparison of the Canon 500D and Olympus 7010.
Now lets look at the top view comparison of Canon 500D and Olympus 7010.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Olympus 7010 is significantly lighter (375g ) than the Canon 500D 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 500D, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Canon EOS 500D (EOS Rebel T1i / EOS Kiss X3) nor Olympus Stylus 7010 (mju 7010) 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 DSLR Cameras with Weather Sealing Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Canon 500D's 3.00" LCD screen is slightly larger than Olympus 7010's 2.7 screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.