Panasonic Lumix G Vario Mega OIS 45-150mm F/4-5.6 ASPH (MFT-Mount) LEN1192

The 45-200mm Æ’/4-5.6 OIS is the second lens released by Panasonic in its line of Micro Four-Thirds compatible lenses. When mounted on a micro four thirds compatible camera, the size of the sensor produces a 2x crop factor, meaning an equivalent field of view of 90-400mm in 35mm film terms. Panasonic is one of the early pioneers in optical image stabilization systems, so it's no surprise that the lens features its Mega O.I.S. technology to reduce the effect of camera shake. The 45-200mm isn't a ''constant'' lens, in that as you increase the focal length, the maximum aperture size decreases, though the minimum aperture remains the same.