Step Up Rings: I also bought both Lucid's Brass 72-82 + 77-82 Step Up Rings to fit my existing lenses, for 11 $.95 each. The 72-82 has a regular serrated leading edge. [I used this boost ring when testing this set of 3 filters.] 77-82 has a nicer jagged side edge [Breakthrough X4 style]. I don't know why that knurled side hem isn't standard across the board, but it isn't. Good thread milling: no stuck filters. High quality and low price.
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