step up rings?
Shouldn't be any problem. Using step up rings for filters or addon lenses or extenders is always best, since the diameter is bigger than the lens...it's only when using step down rings that you could run into vignetting issues. As mentioned, the one downside if any might be that it will prevent the kit lens hood from being used.
As for the step rings, I don't buy them off eBay - they're pretty much just as cheap off places like Amazon, where you can get them guaranteed in 2-3 days from a reliable source.
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