The samyang af 50mm f14 fe is specifically designed to work in harmony with full frame sony fe mount mirrorless cameras the flow of light is devised based on the uniqueness of the distance from glass to sensor in mirrorless cameras to create optimal performance along with portability of mirrorless lenses this new samyang af 50mm f14 lens is compatible with full frame sensors to deliver the wideness and sharpness of image to photographers the f14 aperture is by far the brightest of full f