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step on down
Stepping rings are easily obtainable on the old ebay. Just bought a complete set from China for very little cost. Rings convert to and from the common sizes from 43mm up to 82mm .The common ring sizes are 82,77,72,67,62,58,55,52,49mm. For one or 2 rings, a camera shop will have them for not a lot of money. There are stepping rings up or down which can cover a single large range if you have a specific mask size in mind.
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