The Leica 90mm f/2.5 Summarit-M lens is a high-quality portrait lens designed specifically for Leica M mount cameras. With a maximum aperture of f/2.5, it is ideal for capturing detailed and sharp images with a smooth bokeh. The manual focus feature allows for precise control over your shots, while the 90mm focal length is perfect for flattering portraits. Additionally, the lens is compatible with 46mm filters, making it a versatile option for photographers looking to enhance their Leica M series camera setup.