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What is a step up and step down ring?
A step-up ring enables you to fit a filter with threads larger than your lens.
On the contrary, a step-down ring does the opposite (possible vignetting issues).
If you have 72mm lens threads and want to fit a 77mm filter, you need a step-up ring. If you have 77mm lens threads and want to fit a 72mm filter, you need a step-down ring.
Step-down rings are not as often used as step-up rings because, in most cases, the smaller filter sizes result in vignetting.
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