The optical concept of this lens originated with the FL50mm f/1.4 II and FD50mm f/1.4. It achieves more compactness and higher contrast simultaneously

The optical concept of this lens originated with the FL50mm f/1.4 II and FD50mm f/1.4. It achieves more compactness and higher contrast simultaneously. It has been called "the standard lens of standard lenses", because of its high image quality. It has an excellent color balance, which is virtually identical to the ISO recommended reference value.