Wide angle lens series voigtlnder nokton lens mount leica m lens speed 12 focal length 35 mm construction prime lens area of use night photography astrophotography indoor photography action photography landscape photography news photography focus manual focus af motor no internal af motor closest focusing distance 70 cm lens construction groupselements 710 number of aperture blades 12 minimum aperture 22 max aperture 12 filter thread 52 mm