Cooke S2 Cooke S2 18mm Ser. III Cooke S2Aperture: T 2.2 | 22Minimum focusing distance: 0.30 m / 12″Front Diameter: 80 mmWeight: 0.52 kg / 1.4 lb25mm Ser. III Cooke S2Aperture: T 2.2 | 22Minimum focusing distance: 0.45 m / 18″Front Diameter: 80 mmWeight: 0.5 kg / 1.1 lb32mm Ser. II Cooke S2Aperture: T2.3 | 22Minimum focusing distance: 0.30 m / 12″Front Diameter: 80 mmWeight: 0.47 kg / 1 lb40mm Ser. II Cooke S2Aperture: T2.3 | 22Minimum focusing distance: 0.45 m / 18″Front Diameter: 80 mmWeight: 0.52 kg / 1.1 lb 50mm Ser. II Cooke S2Aperture: T2.3 | 22Minimum focusing distance: 0.75 m / 29.5″ Front Diameter: 80 mmWeight: 0.6 kg / 1.3 lb75mm Ser. II Cooke S2Aperture: T2.3 | 22Minimum focusing distance: 1.20 m / 47″Front Diameter: 80 mmWeight: 0.75 kg / 1.6 lb100mm Ser. II Cooke S2Aperture: T2.8 | 22Minimum focusing distance: 1.20 m / 7.2′Front Diameter: 80 mmWeight: 1.04 kg / 2.3 lb