After using Summitar or Summicron , you will not be able to believe how colors can be so natural and degrades elegant , how glass , winter light is elegant with the first one and if you go dark , it will turn wild and gives the most elegant skin details than any other lens , cron is a magic also , it is more colorful than summitar and you will not believe your eyes how street photographs , most ordinary pictures keep many other picture subject in it , post box , telephone box , any ordinary thing turn in to painting. They are matchless and I dont like M camera bodies.