Standard lens series voigtlnder sl ii voigtlnder ultron lens mount nikon f lens speed 2 focal length 40 mm suitable for sensor types aps c full frame construction prime lens area of use night photography astrophotography indoor photography action photography news photography focus manual focus af motor no internal af motor closest focusing distance 38 cm lens construction groupselements 56 number of aperture blades 9 minimum aperture 22 max a