This is a lightweight, compact, and ultra high power zoom lens designed exclusively for digital SLR cameras with APS-C sized image sensors. The focal length of this lens is equivalent to approximately 29-400mm in 35mm format. This lens offers an extreme zoom ratio of 13.9x, and is designed as the everyday "all-in-one" lens for digital SLR cameras, covering wide angle to long telephoto. The lens uses an optical system specially designed for digital SLR cameras. This resulted in the sufficient compensation of aberrations, including astigmatism, compactness, thanks to the downsizing of the first group, a high zoom power, and optimum optical quality.