For a greater reproduction scale in macro photographyThe spacer rings are mounted between lens and camera and extend the distance between lens and image plane in macro photography. That way, the reproduction scale is increased and the depth of field is decreased. This allows you to set apart the object from the background more easily. The spacer rings can be used with various lenses.
Three spacer rings for more flexibilityThe set consists of three spacer rings in different sizes. They allow you to decrease the minimum focus distance of your lens in three different steps, which automatically increases the reproduction scale. They can also be combined with each other. However, that decreases the lens speed which is why the use of a tripod is strongly recommended.
Contacts for data transferThe spacer rings are equipped with contacts for transferring the EXIF data. Exposure measurement is possible in TV and AV modes. The auto focus also works due to the contacts.