Leica APO-SUMMICRON-SL 90mm f/2. Personally, I think this is one of the best lenses Leica has ever made. The smooth bokeh in portrait photography is so beautiful that it's my favorite of all the APO-Summicron lenses. The exterior has some scratches, but the image quality is exceptional, so I think many people who try it will find that it's the only lens they want to use. leica Leica SL SL2 SL2-s SL3 Apo-Summicron noctilux summilux