The "M Lens" refers to a type of camera lens designed for use with Leica cameras, particularly the Leica M series. These lenses are known for their high optical quality, compact size, and manual focus capabilities. They are favored by photographers who appreciate precision and the tactile experience of adjusting focus and aperture settings manually. M Lenses come in various focal lengths and apertures, allowing photographers to choose the best option for their shooting style. They are often made with premium materials and feature advanced optical designs to minimize distortion and enhance image clarity. This makes them popular among both professional and amateur photographers.