This is a lens adapter for Volna-3 lens from the USSR, specifically for the Kiev 88 and Salute versions, so you can use it with your Canon EF camera. Note that this adapter is only for EF bayonet and is not compatible with EFS! Also, this adapter is specifically for the "В" version of the lens and not for the "В" which is the same as the Pentacon-Six. Remember that Russian bayonets have letter marks in the name of the lens, and "Б" and "В" are different types. Likewise, the name of the Volna lens is not always the name of the bayonet itself.
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