Sell Svbony Telescope Filter 2 inches SHO Filter Set H-Alpha OIII SII 7nm Narrowband Astronomical Photographic CCD Filter Color Filter for Deep Sky Photography best price

Features: 1. The H-Alpha 7nm is an extremely narrow emission-line filter that works by allowing a 7nm bandwidth of light, centered on the 656nm wavelength through, and blocking the transmission of contrast-killing light pollution wavelengths. Wavelengths that are responsible for natural light pollution, or skyglow, are drastically reduced, as is artificial light pollution caused by high and low pressure sodium vapor and mercury vapor lights. The result is a high contrast image that reveals the H-alpha line in all its glory 2. The Sulfur II 7nm Extra Narrowband Filter transmits a 7nm bandwidth of light that is centered at 672nm and drastically reduces other transmissions, including wavelengths of light that are responsible for light pollution (both artificial and natural). Like all SVBONY filters that are designated as “CCD”, this SII filter also blocks infrared wavelengths from 700nm to 1100nm so you don't need a separate IR-Cut filter 3. The Oxygen III 7nm Extra Narrowband Filter transmits a 7nm bandwidth of light that is centered at 500nm and drastically reduces other transmissions, including wavelengths of light that are responsible for light pollution (both artificial and natural). Like all SVBONY filters that are designated as “CCD”, this OIII also blocks infrared wavelengths from 700nm to 1100nm so you don't need a separate IR-Cut filter Specification： Model : F9169B Spec : H-Alpha 7nm Transmission Line Wavelength : 656nm Thread : M48*0.75 Model : W9121B Spec : OIII 7nm Transmission Line Wavelength :500nm Thread : M48*0.75 Model : W9122B Spec : SII 7nm Transmission Line Wavelength : 672nm Thread : M48*0.75 Package Including: 1x H-Alpha 7nm filter or none 1x OIII 7nm filter or none 1x SII 7nm filter or none 1x Sturdy plastic box