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The T2 rings are simple but fundamental accessories to use Canon EOS for astrophotography, allowing you to connect these cameras to telescopes or to various accessories such as photographic adapters, off-axis guides or focal reducers. But in some cases, such as when we want to use an off-axis guider with a DSLR, it is difficult to place a filter since, if you connect it in front of the off-axis guider, you would also filter the light sent to the autoguiding camera (making more difficult to find the guide star).
This ring solves this problem allowing you to insert a normal 50.8mm filter (without the filter stop barrel you have to insert just the 46mm diameter disc glass filter) inside the T2 itself ring. So you can remove the lens from your Canon EOS and insert the T2 ring, just as if it were another lens. In this way you do not only get, in the front of your Canon EOS, a T2 thread to connect the camera to your telescope or other photographic accessories, but you'll also have the filter positioned inside the T2 ring!
All in a simple and safe way, without having to purchase additional filters for your cameras!
Warning: this T2 ring is only compatible with the Canon EOS models and not with other Canon cameras (not EOS series).