The Zeiss 300 mm lens is an f/4.0 lens equipped with multiple features for a professional finish in each photo. The Zeiss lens is a detachable lens compatible with Contax and Yashica cameras. The focal length on the Zeiss 300 mm lens ensures quality photography over a longer distance with crisp details and maximum contrast. The Zeiss lens is ideal for outdoor photography, capable of capturing plants, animals, and more in stunning colors with virtually no chromatic aberration. The Zeiss 300 mm lens can be used as a portrait lens, as its length flattens the facial features, but it is best used for isolating subject matter in landscape and architecture photography. Designed to be lightweight and compact, this f/4.0 lens offers a durable metal casing construction. It has smooth and clear glass optics that cancel out flare due to refraction.