As an advanced weapon for deep space observation, this 2-inch O-III filter adopts the third-generation ion beam sputtering coating technology to accurately lock the 496nm/501nm dual ionized oxygen emission bandwidth ±3nm), suppressing 90% of urban light pollution lamps while maintaining a light transmittance of 93% in the target band. Its large-size design is specially optimized for the high-end 2-inch eyepiece system. The actual measurement can increase the resolution of the shell structure of planetary nebulae (such as the M57 ring nebula) by 40%, and make the fibrous ionizing gas visible of the supernova remains (such as the veil nebula NGC 6960) reach the observation of Bortle 4 area, etc. Effect.

The mirror body adopts aviation aluminum alloy ring and λ/4 optical flat glass, and is equipped with a moisture-proof and shockproof storage box as standard. It is the core choice for astronomical enthusiasts to upgrade the equipment library after UHC filter.

● Kson 2” O-III Telescope Eyepiece Filter

● Shockproof ABS storage box