Telephoto lens series samyang asp lens mount canon ef lens speed 14 focal length 85 mm suitable for sensor type aps c construction prime lens area of use portrait photography night photography astrophotography action photography focus manual focus internal focus closest focusing distance 100 cm lens type aspherical lens construction groupselements 79 number of aperture blades 8 minimum aperture 22 max aperture 14 filter thread 78 mm coati