This Sigma EX lens is a great addition to your camera gear. With a maximum aperture of f/3.5, it's perfect for capturing stunning photos in low light. The lens is designed for Pentax cameras and is part of the Sigma EX series. It's an aspherical lens with a focal length of 15-30mm, making it ideal for a range of photography styles. The brand is Sigma, known for producing high-quality lenses that stand the test of time. This lens looks unused and is sure to become a favorite in your collection. I inherited this it looks brand new.