Thread mount (LTM) 90mm rangefinder lens with coded Leica L mount base plate. The Voigtlander APO-LANTHAR 90mm F3.5 Telephoto is a lens that is compatible with Leica M mount cameras. It has an aperture range of f/3.5 to 22.0 and can focus to 1.64 feet. The lens is part of the Voigtländer rangefinder series and has an LD element that makes it apochromatic at all three wavelengths. The lens is compact and can fit in a jacket pocket. The Voigtlander APO-LANTHAR 90mm F3.5 Telephoto is a great lens for portrait photography. The lens’ apochromatic design ensures that the images captured are sharp and free of chromatic aberrations . The lens is also capable of producing beautiful bokeh, making it ideal for portraits and other types of photography where a shallow depth of field is desired. This lens is a LTM lens with a coded M-mount base plate that works with Leica's lens coding system as found on the M10 and M11.