Feature: 1. Advanced knurling technology, prevent hand slip, convenient to disassembly. 2. High quality aluminum frame designed, frame front with thread, can install lens cover and other accessory at any time. 3. Rotating filter, outer ring can adjust the wavelength arbitrarily, from 530nm to 750nm change. 4. Suitable for infrared photography creation, very practical integrated adjustable infrared filter, can provide you with more operable content of infrared photography creation. 5. For internal and weak shadows, use 680nm, using 750nm indoors and in low light. Specification: Condition: 100% Brand New Item Type: Infrared Filter Brand: FOTGA Material: Aluminum Alloy + Optical Glass Color: As Pictures Shown Quantity: 1PCS Wavelength: 530nm、590nm、630nm、680nm、720nm、750nm Main Function: Rotating Filter, Outer Ring Can Adjust Wavelength Arbitrarily, Can Adjusted From 530nm To 590nm and Then To 630nm Until Adjusted To 750nm Weight: Approx. 37g Frame Thickness: Approx. 1.6cm/0.63inch Optional Filter Interface Diameter: Approx. 43mm/1.69inch, 46mm/1.81inch. Package List: 1 x Infrared Filter