Working but priced cheaply as lens has a bit of fungus at the edge in optics but still very useable.

Made for film cameras if you do mountbit on a early canon digital it will only allow the csmera to fire when set to 5.6.

The Carl Zeiss Jena 400mm f/5.6 lens, compatible with Canon cameras, is a high-quality telephoto lens perfect for capturing distant subjects with precision. With a maximum aperture of f/5.6, this lens allows for sharp images with minimal depth of field. The lens is designed for Canon cameras and features automated focus, making it easy to capture clear and detailed shots. Additionally, the 72mm front lens and filter size ensure compatibility with a variety of accessories. Ideal for photographers looking to expand their kit with a reliable and versatile telephoto lens.