The Urth 77 mm Infrared R72 Lens Filter Plus+ is a professional optical filter designed for infrared photography applications. With a diameter of 77 mm, this filter effectively blocks all visible light wavelengths below 720 nm, allowing photographers to capture the otherwise invisible infrared spectrum for unique creative images. The filter construction features high-quality R72 glass with 20-layer nano-coating technology, enhancing ease of cleaning while providing superior protection against water, oil, and scratches. This advanced coating system ensures higher maximum light transmission and consistent transmission curves, resulting in sharper images with finer color reproduction and improved depth. The ultra-thin filter frame is specifically designed to prevent vignetting and is made from durable magnalium alloy for long-term reliability. All filters include double-threaded mounts for filter stacking or attaching screw caps. This infrared filter is particularly suitable for outdoor and nature photographers seeking creative experimentation opportunities. The product is not compatible with cameras that have built-in infrared block filters on their sensors. Urth emphasizes environmental responsibility through sustainable design practices, using eco-friendly materials and recyclable packaging while committing to reforestation initiatives.