A step up adapter is a good tool for getting the most out of your expensive filters. Graduated filters don't work so well using this technique, but imagine using one filter type for multiple thread sized lenses. Step-up rings can also be stacked to get even more use out of a single filter. Keep in mind though that the closer the filter is to the lens, the better the results will be.
Another useful feature is that this step-up ring can be used to prevent vignetting. Sometimes a filter can produce vignetting, especially on wide angle lenses. Stacking filters may cause vignetting as well. If using the adapter ring with larger sized filters, the problem may be eliminated as the filter rings are expanded out beyond the lens.
This Step-up ring is made of a sold and sturdy but light weight metal construction. I tend to pack a lot of equipment into my camera backpack and carry it all over the place. Not only does this tool reduce my equipment expense, but limits the number of items I carry around.
The only problem I've seen with using a step-up adapter is that the lens hood at the same time is pretty much out of the question. This should be expected though as this is a common issue of any step-up ring adapter.
PROS: Solid metal construction Allows one to use their expensive filters for their 77mm lens other lenses Light weight and easy to use
CONS: Makes using the lens hood on your other lenses difficult if you are able to use it at all
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