Heavy on the 52mm ring size=Nikon.
For my taste, a ring of "extra" material on the front of any lens is protection for both the optic and the threads. Had my share of "dents-n-dings" and found it cheap insurance.
Reformed Photojournalist Former USAF Phlyin' Photog "The brave ones shot bullets, the crazy ones shot film!" --Joe Longo, WW-II Army Combat Camera
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