Precision-engineered adaptor ring for seamless connection between B70 lens thread and Lee 100 Filter Holder Quick-release, spring-loaded mechanism for secure and easy attachment of filter holder Constructed from high-quality aluminum for enhanced durability and reliable lens-filter connection Versatile design compatible with both standard and wide-angle lens configurations Wide-angle adaptors designed to prevent vignetting, ensuring clear, edge-to-edge photography Essential accessory for professionals and photography enthusiasts seeking to enhance image quality