Panasonic ET-DLE310 is a middle-throw zoom lens designed for DLP-based Panasonic projectors and mounted on the projector (not a standalone accessory). Optical specs include F-number from F/2.4 to F/2.8 and a focal length range of 48.4–63.3 mm. External dimensions are 95 mm W × 95 mm H × 171 mm D and mass 1.1 kg. Throw ratio band is 3.5–4.7:1 (Long-Throw). It is discontinued; ET-DLE350 is listed as the successor.