I made this photo yesterday to show my "Mini Ms". All these are Leitz Summar lenses with a maximum aperture of f/4.5. Infinity corrected (not all were! but the samples used here are)so usable for other than Macro that they were made for. They are very functional and I use them. Incredible performance (better on the 6 , 5N, C3.. than the dark cornered 7), wide open.
NEX-7, Speed Booster, Olympus OM 50/3.5, pop up flash
The 42/4.5 Summar was the one used to assemble Leica's Ur-Leica.