Step Ring Filter Adapter
Adapter ring for combining filter & lens with different size
With the help of a filter adapter you can mount a filter to your lens although they have connecting threads with different sizes. Stepping adapters subdivide into step-downs and step-ups. With a step-down you can attach a filter with a smaller diameter than your lens has (e.g. 55mm filter on 58mm lens). Step-ups are used vice-versa (e.g. 58mm filter on 55mm lens). You can use step rings for any gear with a standard filter thread such as filters, close-up lenses, macro reverse adapters etc.
You will find the ratio from lens to filter in the head of this article. The first size refers to the filter thread of the lens, the second size refers to the connecting thread of the filter.