The E-72 II 72mm Lens Cap from Canon is a center-squeeze snap-on type lens cap for Canon EF and EF-S lenses with a 72mm front diameter. A front lens cap protects the lens from scratches, moisture, dust and fingerprints when the lens is not in use. Compatible Lenses Include: Canon EF 135mm f/2L USM, EF 180mm f/3.5L Macro USM, EF 200mm f/2.8L II USM, EF 20mm f/2.8 USM, EF 28-135mm f/3.5-5.6 IS USM, EF 35mm f/1.4L USM, EF 50mm f/1.2L USM, EF 85mm f/1.2L II USM, EF-S 15-85mm f/3.5-5.6 IS USM, EF-S 18-200mm f/3.5-5.6 IS, TS-E 45mm f/2.8