Voigtlander Nokton 28mm f/1.5 for E series. A fast compact 28mm optimized for E sensors. The new Voigtlander 28mm E mount Nokton features outstanding optical performance using two Aspherical Elements with four Aspherical Surfaces and two abnormal Partial Dispersion elements with 10 elements in 8 groups. Even with a fast F1.5 aperture this new E wide angle is only 55mm long. The 12-blade aperture diaphragm provides beautiful bokeh . The aperture diaphragm is configured with 12 blades to make the aperture opening as circular as possible. This means the out-of-focus areas of images are drawn naturally and point light sources etc. are drawn as soft round bokeh rather than as polygonal shapes. The lens aperture ring controls the aperture, not the camera's control dial. Minimum focus distance of 0.28 meters . Beautiful bokeh is enhanced with “circular bokeh” from the nearly circular apertures. The metal lens hood is included. Filter size is 49mm.