- To mount filters and other attachments with a diameter of 49 mm to lenses with a diameter of 52 mm ,- Adapter for all lenses and attachments with screw thread ,- Precision metal rings with matt black surface , ,Note for Consumers: ,Small filters on large lenses can result vignetting - especially in strong light or wide angles. - Adapter Thread: 49 mm ,- Adapter Thread Type: Screwed Socket ,- Camera/Lens Thread: 52 mm ,- Camera/Lens Thread Type: Screwed Socket ,- Colour: Black 2 years legal warranty only