This filter is well-made and has a narrow band pass in the green visible spectrum, which can best observe the emission nebula. Its multi-functional features make it suitable for smaller telescopes, providing an excellent universal solution for observing nebulae.​

As a core essential filter for deep space observation, this product uses ion beam deposition coating technology to achieve ultra-narrow band penetration in key green spectral regions, with a light transmitting rate of up to 92% while blocking more than 90% of urban light pollution.​

Measurements show that its patented optical structure can darken the background skylight by 2.5-3 magnitudes, producing an extreme sky- nebular contrast ratio of 5:1 on targets such as the M8 lagoon nebular, and can clearly analyze the fibrous structure of the ionized hydrogen region even with a 70-150mm small-caliber telescope. The aluminum alloy mirror ring combined with zero stress lens fixation technology ensures the long-term use of light-free axis offset, which is the ultimate solution for urban astronomers to break through the limit of light damage. It is especially suitable for observing classic emission nebulae such as Orion Nebular (M42) and Eagle Nebular (M16).​

● Kson 1.25″ Telescope Eyepiece UHC Filter (optical glass material, aluminum alloy mirror ring anti-deformation);

● Shockproof ABS storage box