About 67 years ago, the U. S. Navy ship I served on visited Singapore for R&R. I promptly scouted all the major camera stores and put in an order at the biggest for a Leica M-4 (which had just been released) and other Leica lenses, including a Summicron. I used that lens intensively until changing to digital cameras 12 years ago. After 55 years of hard usage from above the Artic Circle to the equator, it showed signs of abuse, but still delivered fine images. Indoor sports were shot at f/2 with distinctly better results than faster Nikkor lenses on LTM cameras and SLRs. Simple but critical comparisons between the Summicron and a variety of lenses from other makers confirmed its excellence.