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 SX40 HS and Canon SX30 IS side-by-side from the front, back and top in their relative dimensions. Canon SX40 HS has external dimensions of 123 x 92 x 108 mm (4.84 x 3.62 x 4.25″) and weighs 600 g (1.32 lb / 21.16 oz) (including batteries). 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).
Below you can see the front view size comparison of Canon SX40 HS and Canon SX30 IS. In this case, we can see that Canon SX40 HS and Canon SX30 IS have the exact same height, width and thickness.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon SX40 HS is 1g lighter than the Canon SX30 IS but we don't think this will make a significant difference.
Unfortunately neither Canon PowerShot SX40 HS nor Canon PowerShot SX30 IS provides any type of weather sealing in their body, 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
LCD Screen Size and Features
Canon SX40 HS and Canon SX30 IS's LCD screens has the same diagonal size of 2.7".
Both cameras feature Fully Articulating screens
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels. Fully articulating screens are also useful for taking Selfie shots and video.