Panasonic SR100500 Lumix S 100-500mm f/5-7.1 O.I.S. Lens (L-Mount)The first ultra telephoto zoom in the Lumix S series, the Panasonic Lumix S 100 500mm f 5 7. 1 O. I. S. Lens combines long reach with a compact 7. 7" long form factor. Capturing subjects from distant wildlife to fast paced motorsports, this lens delivers sharp rendering across its zoom range, with a 19 element, 12 group optical design that delivers crisp resolution, natural bokeh, and smooth transitions between focus and background across its zoom