Zoom to 800 mm for the beauty beyond the reach of the naked eyeThe Fe 400-800mm F6.3-8 G Oss is Sony's first a Lens that zooms to 800 mm, with a range that is ideal for distant subjects as well as the creation of telephoto compression. The fast, precise Af lets you capture subjects that can't be approached closely, such as wild birds and wild animals, and draw them into the full picture. The internal zoom design minimizes center-of-gravity shift for smooth handling.Go long with the first a Lens: 400-800 mm super-telephoto zoomThe Fe 400-800mm F6.3-8 G Oss is the first a Lens to cover a 400 mm to 800 mm super-telephoto range. An optional 2x teleconverter can extend maximum focal length to 1600 mm. The internal zoom means the length of the lens does not change, and the center of gravity stays within a small range for stable handling. Smooth, easy zoom ring rotation allows precise zooming, while careful design prevents accidental focal length changes.