Designed for use with 3-chip DLP projectors, the Panasonic ET-D75LE30 Zoom Lens allows you to vary the projection distance by adjusting the focal distance, which is 50.5 – 97.9mm for this lens. It has a zoom ratio of 1.9:1 and a standard-throw ratio that fluctuates depending on the aspect ratio of your projector. Installing a zoom lens affords greater flexibility. You can compensate for miscalculations during installation and by changing the projection distance with your zoom lens, it’s possible to adjust your display proportions depending on class size or type of presentation.