What is Lens? Jon March 29, 2018 03:38 Updated Follow Lens is a browser plug-in that allows users convert altcoins to Bitcoins directly from their browser. Related articles Who is Lens For? What is Shifty? Who is the ShapeShift API For? How Quickly Do You Use Coins that are Deposited? If I Exchange BTC for LTC, and then Exchange LTC Back to BTC, Will I Get the Same BTC Back? How Does the Shifty Button Work?