Focal Reducer speed booster turbo adapter for Pentax PK Lens to m4/3 mount camera GF5 GF6 GX7 EM5 E-PL6 E-PL5 E-PM2  OM-D focal reducer speed booster turbo adapter ring for pentax pk lens to m4 3 mount camera gf6 e pl6 gx1 gx7 em5 em1 e pl5 bmpcc