I recently learned about “Step Up” and “Step Down” rings. These are great to have and can save on the expense of purchasing filters for each camera lens. The conversion rings can be used with filters/accessories of one size and convert the diameter to a different size. Step Up or Step Down? When stepping down watch for vignetting. Because the actual filter size is smaller than the lens, there can be dark corners in the photograph. An actual photo of the rings were not available through Zemanta here. Click on the photo of the filter below to view step up/down rings sold at Amazon.