I got this in the ebay auction for my camera. What is the name of it so i can find out more about it? All im gathering is that its a way to make copies of photos from the negatives (did i say that right?) I hope i can use it.

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The lens was very hard to get on, and im wondering if its a different mount. However, it mounted to the camera body just fine.

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Not sure where to begin with this one....