If you are looking to invest in really good Leica lenses, then the best place to do your shopping would be Diamonds Camera. Here you will be able to navigate through several models, suitable for your specific camera. Read through the specifications and you will get a clear understanding about factors such as focal length, aperture and bokeh. Armed with all this knowledge, you can choose the lens that works best for you, at a price that is already the best in the market.