The ZOOM PROJECTION LENS 4" TO 6" F3.5 PROJECTOR LENS is a high-quality lens designed for slide and movie projection. Compatible with ZOOM brand projectors, this lens offers a versatile focal length range of 4" to 6" for clear and detailed projections. With a precise F3.5 aperture, this lens ensures sharp image quality and vibrant colors for an immersive viewing experience. Perfect for film photography enthusiasts and professionals alike, the ZOOM PROJECTION LENS is a reliable and essential tool for enhancing your slide and movie projection setup.