The Sill Optics 137315 Q Beam Expander is a high-quality lens specifically designed for film photography. With a magnification of 1:5X and a wavelength of 532 nm, this beam expander is ideal for precisely focusing and illuminating subjects in your photos. Made by the reputable brand Sill Optics, this lens ensures sharp images and clear details, making it a valuable tool for photographers looking to enhance their work.