With a 100-400mm equivalent focal length range on Micro Four Thirds cameras, this telephoto prime is well suited to working with distant subject matter. Bright f/2.8-4 maximum aperture range excels when working in difficult lighting conditions and provides increased control over depth of field. Two ultra extra-low dispersion elements and two extra-low dispersion elements minimize various aberrations in order to produce a high degree of clarity, sharpness, and color accuracy. Two aspherical elements and one ultra high refractive index element help to reduce distortion and spherical aberrations for improved sharpness and accurate rendering throughout the zoom range. Nano Surface Coating has been applied to individual elements to reduce flare and ghosting for improved contrast and color neutrality. POWER Optical Image Stabilizer minimizes the appearance of camera shake for sharper handheld shooting, and also supports the Dual I.S. and Dual I.S. 2.0 functions for increased stabilization performance. A 240 fps AF motor offers fast, precise, and near-silent focusing performance to benefit both stills shooting and video recording applications. Splash, dust, and freezeproof design benefits working in inclement weather conditions down to -14°F. Compatible with optional 1.4x and 2x teleconverters to further extend the effective reach.