Feature 1 TX-13 telephoto lens with magnesium and aluminum alloy body, environmental protection high-grade rubber for anti-skid treatment. 2 FMC coating is adopted, and multi-layer coating is applied to lens and prism, so as to enhance light transmittance, which is up to 98.5%. 3 The prism adopts the K9 prism with a higher refractive index to make the imaging clearer. 4 With 37mm thread interface, suitable for 37mm fixed focus digital camera and mobile phone. 5 Lightweight, easy to carry. Distortion resistant design. High color reduction. Features: TX-13 telephoto lens with magnesium and aluminum alloy body, environmental protection high-grade rubber for anti-skid treatment. FMC coating is adopted, and multi-layer coating is applied to lens and prism, so as to enhance light transmittance, which is up to 98.5%. The prism adopts the K9 prism with a higher refractive index to make the imaging clearer. With 37mm thread interface, suitable for 37mm fixed focus digital camera and mobile phone. Lightweight, easy to carry. Distortion resistant design. High color reduction. Suitable for travel, concerts, watch the ball game, bird watching, etc. Specification: Condition: Brand New Material: Aluminium alloy Model: TX-13 Magnification: 12X Objective: 32 mm Eyepiece diameter: 19.5mm Lens diameter: 42mm Prism: K9 Prism type: ROOF Exit pupil diameter: 4mm Coating: FMC Related brightness coefficient: 16 Angle of view: 7 Exit pupil distance: 15mm Close range: 5m Diopter adjustment: -4D ~ +4D Thread connection: 37mm Size: approx. 150x45x45mm/5.9x1.8x1.8inch Weight: approx. 295.5g Package List: 1 x TX-13 Telephoto Lens 1 x Lens Cover 1 x Storage Bag 1 x Clean Cloth 1 x Phone Clip 1 x Manual