Step down and step up rings allow you attach different accessories to a lens that what the filter thread would normally allow.
Step up ring adapter.
Although step up adapter rings all serve the same purpose it s a good idea to consider a few things before purchasing.
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This step up ring.
Unless you have unused image circle available to be blocked with the step down ring or unless the filter threads are far enough outside of the lens angle of view to accommodate the ring you will experience mechanical.
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Filters used on step up adapter rings are typically circular polarizing filters or neutral density filters.
For example a step up ring will allow you attach an accessory with a larger filter thread diameter than the lens has.
Adorama step up adapter ring 67mm lens to 77mm filter size.
Step down rings are also available but they seldom make sense.
A step down ring will allow accessories with a smaller filter thread to be used on your lens.
Adapter rings are labeled from the camera to the filter.
The starting point for configuring a step up ring system is to establish a pecking order from widest diameter thread size to the smallest.
As an example if you own three lenses one with a 52mm thread another with a 67mm thread and a third with a 77mm thread you want a filter to fit the widest diameter thread size in this case 77mm and a pair of step up rings 67 77mm and 52 77mm to.
For example a 25 5mm to 46mm step up ring is used for a camera or lens with a 25 5mm thread.
The second number is the size of the remaining thread a female thread.
2 packs 72 82mm step up ring adapter 72mm to 82mm step up filter ring 72mm male 82mm female stepping up ring for dslr camera lens and nd uv cpl infrared filters by fotasy 5 69 5.
Knowing the size of your camera lens and filter is the critical factor when determining step up ring size.