B & W Step-Down Adapter Ring From Filter 72MM To Lens 58MM. This adapter enables a filter with an attachment size of 72mm to be used with a lens with an attachment size of 58mm.

B+W Step Up Ring enables a filter with an attachment size of 72mm to be used with a lens with an attachment size of 58mm.
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Heliopan Step Down Rings allow smaller sized filters to be used on lenses with larger front filter thread sizes.

[^o)] Excuse my ignorance once again but I find the above titles and corresponding definitions very confusing &amp; they are directly from the Overview sections to purchase them! I came real close to almost ordering what I don't want and already have! [8-)]

Anyway, I have two brand new B &amp; W 58mm filters that werepurchased to useon my Canon 85mm lens that I now no longer own. I am looking for adapter rings that will allow me to use these filters on my 72mm&amp; 77mm sizelenses. Obviously, it is the Heliopan Step Down Ring that I need. Only problem is I can only finda 72mmat B+H and it takes 6-10 weeks (non-cancelable, non-returnable) plus it costs over twice as much as a B &amp; W adapter ring. The 77mm is out of stock and they will notify me when it becomes available.

Next Option - sell the two filters (at a loss) and buy the sizes I need.

Does anyone know where B &amp; W adapters are availble in the sizes I need or is it a bad idea to attempt this size difference (possible vignetting)? Would it be best to only go up to the 72mm or doesn't it make a difference? Going the oppposite way, I have adapters that make my larger filters fit on smaller lenses and they seem to work ok.

Thanks!

Denise