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DSLR's T ring adapters are standardized to have the focal point be 55mm behind the front of the t-ring, this is so no matter what brand of camera you attach with various t-rings, it should be in focus,
So you may need to space things depending on if you have enough focusing range to put the front of the t-ring in the right place,
In this case the reducer is implying that any camera should be able to connect to the end of it without any need for spacers, as that distance is 55mm behind it.
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