Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Canon SX30 IS and Canon 1D C side-by-side from the front, back and top in their relative dimensions. Canon SX30 IS has external dimensions of 123 x 92 x 108 mm (4.84 x 3.62 x 4.25″) and weighs 601 g (1.32 lb / 21.20 oz) (including batteries). Canon 1D C has external dimensions of 158 x 164 x 83 mm (6.22 x 6.46 x 3.27″) and weighs 1500 g (including batteries).
Below you can see the front view size comparison of Canon SX30 IS and Canon 1D C. Canon SX30 IS is 35mm narrower and 72mm shorter than Canon 1D C but it is also 25mm thicker. As you can tell, actually this is not a fair size comparison since Canon SX30 IS has a built-in lens but Canon 1D C doesn't. Once you put a lens on 1D C, its thickness will increase significantly.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon SX30 IS is significantly lighter (899g ) than the Canon 1D C 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 1D C, the total kit will weigh much higher.
Thanks to the weather sealed body of 1D C, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to SX30 IS.
LCD Screen Size and Features
Canon 1D C's 3.2" LCD screen is slightly larger than Canon SX30 IS's 2.7" screen.
On the other hand, Canon SX30 IS sports a Fully Articulated screen
which you can change the angle and position of the screen almost freely, making it possible to shoot from waist or over the head levels, and especially very useful for shooting selfies and video. On the other hand, Canon 1D C has a fixed type screen which provides almost no flexibility in shooting positions compared to SX30 IS.