The close-up filter set from dHD Digital is made from tempered optical brand real glass. This brand look has been embedded in an aluminium precision frame. The aluminium frame has both an internal thread and an external thread, which allows the attachment of a lens cap or the combination of additional filters. Close Up filters reduce the shooting distance of the lens, which leads to a magnification of the shooting object. The indicated dioptres correspond to the magnifications. You can also combine several close-up filters together. The set consists of: +1 Close Up Filter + 2 Close Up Filters + 4 Close Up Filters + 10 Close Up Filter Storage Case Try it, you will be amazed by the dHD Digital Close-Up Filter Set!