Excellent Optical Performance (sharpness, color reproduction, distortion control, and optical aberration control) throughout the entire lens set. All Irix Cine Lenses are Weather Sealed and are MILITARY GRADE CERTIFIED. Irix Cine lenses received the MIL-STD-810 Certification for Freezing Rain / Icing and Humidity. All Irix Cine lenses have engraved markings with UV Light Reflective Paint for working in low-light or dark conditions. All you need is a small blacklight flashlight. Stop using a bright flashlight that will blind you and everyone working around you. The Irix 65mm T1.5 has a Front Filter Thread of 86mm and is also compatible with Irix Edge Magnetic Filters. The front diameter of the lens is 95mm, making it easy to use standard accessories such as matte boxes.