Canon has announced a number of compact camera updates, bringing a refreshed IXUS model, the IXUS 140, and new affordable PowerShots.The IXUS 140 offers a 8x optical zoom lens with a 28mm wide-angle, running to 224mm at the far end (in 35mm terms). The lens is stabilised to help keep those long shots steady.\u00a0There's 16-megapixel sensor at the heart of the camera, backed by the older DIGIC 4 processor, as well as offering Wi-Fi connectivity with an iPhone and Android app, meaning you can shoot and share your pictures instantly.\u00a0Around the back is a 3-inch LCD display, rounding off a camera that's compact and good looking, and available in grey, silver, red or pink.The Canon IXUS 140 will be available from late-February and will cost \u00a3159.The most advanced of the new PowerShot models is the PowerShot A3500 IS. This model again offers a 16-megpixel sensor, with a 5x optical zoom lens covering 28-140mm (in 35mm terms), with image stabilisation.\u00a0Again you have Wi-Fi connectivity for quality sharing your shots and a slim body finished in metal. There's a 3-inch display around the rear.The Canon PowerShot A3500 will be available from early March costing \u00a3129.Stepping down the PowerShot ladder you have the PowerShot A2600. This model loses the Wi-Fi option and the image stabilisation, but keeps the same zoom range and sensor.The Canon PowerShot A2600 will be available from late February, priced at \u00a3109.Finally the most affordable of the Canon PowerShot cameras is the PowerShot A1400, which has a smaller 2.7-inch display on the back and a design with a more-pronounced grip.It's also one of the few cameras in Canon's compact range that features an optical viewfinder, so might find favour with those who prefer a traditional approach to composing shots.\u00a0The Canon PowerShot A1400 will be available from late February, a snip at \u00a399.