This wide angle adapter screws on to the front of the camera lens. A compatible filter holder is then fastened to the adapter in order to securely hold filters for long exposures. This item is the wide angle version designed to prevent vignetting with wide angle lenses such as the Canon 16-35mm. New! External threading allows the attachment of an 77mm circular polarizer. Thread the polarizer on to the wide angle adapter and then install the filter holder. Features: Screws on to the front of your camera lens in order to attach a filter holder Wide angle configuration prevents vignetting with wide angle lenses Precision machined from lightweight durable aluminum Anodized black coating provides a durable and long lasting finish Compatible with LEE and FilterDude brand holders Shipping: Please ignore Amazon shipping time estimates! Most orders are shipped with 24 business hours with standard shipping and arrive within 1 - 5 business days. We cannot be responsible for shipments lost or returned due to an incorrect address provided by the buyer. We are not responsible for abandoned shipments. The buyer will be charged for additional shipments. If an order is lost or damaged in shipment, a replacement will be sent out at no cost to the buyer. Warranty: All Filter Dude brand merchandise carries a 1 year warranty guaranteeing the item free of manufacturing and material defects.