Wide angle lens series voigtlnder nokton lens mount leica m lens speed 14 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 68 number of aperture blades 10 minimum aperture 16 max aperture 14 filter thread 43 mm