I forgot to bring string. I forgot to breadcrumb my journey. Surely I have fallen down the well now. So, what is the Leica Tri-Elmar and what do I think about it? Should every M user have one?

  But do you have time for three Leica lenses in one? (image: Tri-Elmar at 50mms from a Jpeg) Just a warning! I'm going to be a bit hazy...