The medium canon erc e5m raincover is designed to cover all canon eos camera bodies and protect them from rain and drizzle the medium includes two detachable eye pieces large and small one for eos 1 series bodies and another for all other eos cameras it is compatible with the ef 300mm f28l is ef 400mm f4 do is ii usm ef 200mm f2l is usm and ef 300mm f28l is ii usm lenses