Panasonic SR1840 Lumix S 18-40mm f/4.5-6.3 LensTouted as the world's smallest and lightest full frame zoom lens, the 5. 5 oz, 1. 6" long Panasonic Lumix 18 40mm f 4. 5 6. 3 Lens brings high resolution from corner to corner in a unique zoom range for a flexible, versatile, carry around lens. Suitable for landscapes, buildings, and snapshots with a natural perspective, the lens also provides subtle bokeh when shooting subjects with the maximum aperture and at the minimum focusing distance of 5. 9".