Fisheye lens wide angle lens series walimex pro lens mount pentax q lens speed 38 focal length 8 mm suitable for sensor type aps c construction prime lens area of use landscape photography action photography videography close up photography focus internal focus manual focus circular aperture closest focusing distance 30 cm lens type aspherical lens construction groupselements 710 number of aperture blades 9 minimum aperture 22 max aperture 3