The Urth 86-67mm Adapter Ring for 100mm Square Filter Holder is made of aluminium and is used to mount the 100mm Square Filter Holder from Urth on lenses with a 67mm front filter thread.
Urth 86-40.5mm Adapter Ring for 100mm Square Filter Holder
Urth 86-77mm Adapter Ring for 100mm Square Filter Holder
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Urth Lens Adapter Canon FD Lens to Samsung NX Mount
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