The first number indicates the lens filter ring diameter that this ring will mount onto. The second number indicates the filter diameter that can be fitted onto this stepping ring.
For example - this stepping ring will mount onto a lens with a 82mm filter thread and allow you to fit a 67mm filter onto it.
These are a brilliant idea because they allow you to buy one size of filter and then adapt it for use on the rest of your lenses. Or you may have an old filter but its the wrong size for your lens, you could use a stepping ring to adapt it to fit.
We always advise that if you want to buy a filter for use on multiple lenses, buy the biggest sized filter you need and then adapt it for your smaller lenses. These rings will save you money and reduce the number of filters you need.
These are excellent high quality black metal rings
To Fit Lens Front (mm): 82
Top Tip - If you are unsure of the size you require, most lens caps will have the filter thread size stamped on the back of them. The lens will also have an indication somewhere, ususally denoted by a diameter symbol ø with a number after it which indicates the filter thread size.
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