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 SX620 HS and Canon SX420 IS side-by-side from the front, back and top in their relative dimensions. Canon SX620 HS has external dimensions of 97 x 57 x 28 mm (3.81 x 2.24 x 1.1″) and weighs 182 g (0.40 lb / 6.42 oz) (including batteries). Canon SX420 IS has external dimensions of 104 x 69 x 85 mm (4.09 x 2.72 x 3.35″) and weighs 325 g (0.72 lb / 11.46 oz) (including batteries).
Below you can see the front view size comparison of Canon SX620 HS and Canon SX420 IS. Canon SX620 HS is clearly the smaller of the two cameras. Its body is 7mm narrower, 12mm shorter and 57mm thinner than Canon SX420 IS.
Here is the back view size comparison of Canon SX620 HS and Canon SX420 IS.
Now lets look at the top view comparison of Canon SX620 HS and Canon SX420 IS.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon SX620 HS is significantly lighter (143g ) than the Canon SX420 IS which may become a big advantage especially on long walking trips.
Unfortunately neither Canon PowerShot SX620 HS nor Canon PowerShot SX420 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 Compact Cameras with Weather Sealing Top Bridge Cameras with Weather Sealing
LCD Screen Size and Features
Canon SX620 HS and Canon SX420 IS's LCD screens has the same diagonal size of 3.00".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.