Item Type: IR cur filter Material: Aluminium alloy, optical glass Weight: Approx. 50g / 1.8oz Diameter: 5.1cm / 2in Package List 1 x IR Cut Filter 1 x Plastic Box 1Standard 2 Inch Thread: Equipped with a standard 2 inch filter frame making it perfectly suitable for 2 inch oculars and other accessories. The lens is an infrared cut off filter to provide the clearest images and mitigate the impact of infrared radiation. 2Effective Wavelength Cutoff: The filter possesses a wavelength cut off of 700nm, successfully retaining the 650nm zone of the for Halpha waveband to match the performance of modified for 300D models. 3Optical Glass Coating: Offering the clearest images and more detail. This IR cut filter results in smaller chromatic aberrations, more natural colors, and finer color gradations. 4Wide Range Application: Can act as a permanent lens protector and is suitable for digital SLRs, CCD cameras, modified network cameras, or digital imaging through a telescope. 5Protective Storage Box: Comes with a sturdy plastic storage box to keep it safe and clean when not in use, ensuring long service and optimum performance. Provide you with a pleasant experience.