I bought a bunch of lenses on ebay, and one of them had a tube screwed onto the front of the lens. The tube has 37mm threads on both ends. What is the purpose of this tube?

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I bought a bunch of lenses on ebay, and one of them had a tube screwed onto the front of the lens. The tube has 37mm threads on both ends. What is the purpose of this tube? submitted by /u/J_onn_J_onzz

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I bought a bunch of lenses on ebay, and one of them had a tube screwed onto the front of the lens. The tube has 37mm threads on both ends. What is the purpose of this tube?

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