Canon has introduced two new bridge cameras into its range of PowerShot devices.

The SX520 HS and SX400 IS offer 42x and 30x optical zooms, respectively.

The SX400HS is a replacement for the SX170, which was a super zoom compact that has been redesigned to fit the bridge style aesthetic for the SX400HS.

With a 42x optical zoom lens, the SX520HS is designed as a more advanced offering, as it also offers manual control, as well as semi-automatic exposure modes.

Canon's HS System combines with a Digic 4+ processing engine for the SX520HS, which Canon claims allows it to be 60% quicker at higher ISOs and 30% faster at focusing and processing than cameras equipped with a standard Digic 4 engine. The SX400IS also has a Digic 4+ processor, but doesn't have the HS system.

Resolution

Both cameras feature a 16 million pixel 1/2.3 inch CCD sensor, although Canon was unable to confirm to us whether they are the same sensor, it would seem likely.

The SX520's lens offers an equivalent of 24-1008mm in 35mm terms, while the SX400's zoom is equivalent to 24-720mm.

In terms of other differences, the SX520 offers full HD video recording (compared with 720p on the SX400) along with Creative Shot.

The Canon SX520HS price will be £299, approx US$540/AU$508, while the Canon SX400IS price will be £249, approx US$450/AU$423. Both will be available from August 2014.