The best replacement for step up ring is step down ring.

The best alternatives to step up ring are rated as following:
★★★★★  step down ring
★  step down

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Speaking about step up ring, one probably shouldn't forget about lens hood.

Other search terms related to step up ring and their ratings are:
★★★★★ lens hood
You have in mind a companion for step up ring and it is not yet here? Propose!



Google Trends

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step up ring
step down ring
step down