The 2 versions of the 50 1.4 that are MC have elements with green/purple reflections. Type 5 has these reflections but does NOT have MC on the name ring. Type 4 (below serial number 1,110,000) has same reflections and DOES have MC on the name ring. Type 3-2-1 are single coated and have G Zuiko (meaning 7 elements, G being the 7th letter of the alphabet) on the name ring. SC coating may have a yellowish look. Last multicoated version with a shade will outperform any SC with a lens shade. John