Standard lens series voigtlnder heliar lens mount leica m lens speed 18 focal length 75 mm construction prime lens area of use portrait photography night photography astrophotography action photography focus manual focus af motor no internal af motor closest focusing distance 90 cm lens construction groupselements 36 minimum aperture 16 max aperture 18 filter thread 52 mm length 74 mm lens diameter 579 weight 427 g included in deliver