Canon picked Tuesday to bring out no less than six new PowerShot A-series cameras to boost its entry level. At the top, the A4000 IS and A3400 IS each have firsts: the A4000 IS has a long 8X zoom, while the similar-resolution A3400 has a 5X zoom but is the first A-series with a touchscreen that can be used to focus or take the shot. These and the other new cameras in the line all have 16-megapixel sensors and 720p video support.
