High-transmission infrared optical glass. Standard front and back threading. | Our Kolari Vision Infrared Lens Filter are perfect for adding to a full spectrum conversion or on top of another infrared conversion to get a different effect. | These are high-quality polished glass IR filters, each with standard front and back threads. | Attention: 550nm, 590nm, 665nm, and Blue IR filters require a converted camera to produce the desired visual effect! | We’re confident in our filter’s performance and durability. We back each unit with a Lifetime Guarantee against defects of any kind. If something is wrong with your Kolari filter, let us know so we can make it right.