Yukon Advanced Optics - Yukon Advanced OpticsYAOW Minox - Minox Schneider Kreuznach - Schneider Kreuznach Steiner-Optik - Steiner-Optik Tamron - TamronTamron Co. Ltd. Tokina - Tokina,Tokina Co. Ltd. Marumi - MarumiMarumi Optical Four Thirds - Four Thirds,Four Thirds Platinum Equity - Platinum EquityPlatinum Equity