DescriptionAperture: T3.9Zoom ratio: 10xWeight (approx.): 10.6 lbs (6.2 kg)Length (approx.): 12″ (30 cm)Close Focus: 5′ 6″Image coverage: 35mm -30mm diagonalFront diameter: 121mmCOOKE 25-250MM T3.9 MK III