The Buhl optical 2" F:2.8 keystopper 835-060 is a high-quality lens accessory designed for photographers looking to achieve precise focusing and sharper images. With a focal length of 2.8, this lens provides a crisp and clear view for capturing detailed shots. The Buhl brand is known for its reliability and durability, making this keystopper a great addition to any photographer's gear. The M6134 model is specifically designed to enhance the performance of your camera lens, ensuring optimal results for your photography projects.