Fisheye lens super wide angle lens series samyang cs lens mount pentax k lens speed 35 focal length 8 mm suitable for sensor type aps c construction prime lens area of use indoor photography landscape photography close up photography focus manual focus closest focusing distance 30 cm lens type aspherical lens construction groupselements 710 number of aperture blades 6 minimum aperture 22 max aperture 35 coating ultra multi coated umc wei