Check the listing for details. Bower Digital Step-Down Adapter Ring 58mm Lens to 46mm Filter. Condition: New. Listed at 8.99 USD. The Bower Digital Step-Down Adapter Ring allows users to seamlessly transition from a 58mm lens to a 46mm filter. This adapter, specifically designed by the brand Bower, enables photographers to easily attach filters with a 46mm diameter to lenses with a 58mm front. This product is ideal for those looking to enhance their photography gear by matching the correct filter size to their lens for a perfect fit and optimal performance.