The 55-300mm f/4.5-5.6 DT Alpha A-Mount Telephoto Zoom Lensfrom Sony is a 5.5x zoom lens, with the 35mm equivalent of a 82.5-450mm focal length. Optimized to work with their A-mount APS-C sized DSLR and SLT digital cameras, the 55-300mm lens is an easy addition to your camera bag, quickly replacing several of your current lenses that you would no longer have to swap between--no longer risking dust, damage or missed opportunities.
One of the greatest features of the lens is Sony's Smooth Autofocus Motor (SAM). This provides you with both fast, smooth, and quiet autofocusing that won't disrupt the audio in your HD video recordings, nor the temperamental wildlife you're zooming in on.
An Extra-Low Dispersion (ED) lens element provides exceptional image quality all the way out to its maximum 300mm focal length--meaning your zoomed images benefit from enhanced clarity and sharpness throughout the frame. The advanced optical design of the lens, with the same elements found in the more expensive premium Sony G lenses, reduces color aberrations and provides excellent contrast to enhance your images before they even reach the camera sensor.