The Carl Zeiss Jena 135mm f/3.5 lens is a high-quality telephoto lens designed for M42 mount cameras. Made in Germany by renowned optics manufacturer Carl Zeiss Jena, this lens is known for its sharp images and manual focus capabilities. With a maximum aperture of f/3.5, it is ideal for capturing detailed shots with a shallow depth of field. The lens is also compatible with filters sized 49mm, making it versatile for a variety of photography styles. Its durable aluminum exterior ensures longevity and reliable performance for photographers looking to expand their creative capabilities.