Vivitar Automatic Teleconverter 3X-4 FL-FD. Double your focal length. Sharp optics, fully working. These are fantastic little bits of kit !
This FD adapter is a great addition to your vintage kit. Turn one lens into two! Perfect if you have a smaller camera bag but want double the lens. You can use these with an adaptor on your digital kit.
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Any questions please don't hesitate to ask!