SVW9187DADB

W9187DA-W9187DB-W9187DC

SVBONY

This 2" SV227 SHO SII, H-a, OIII 5nm Narrowband Filter Set from SVBONY will enhance your photography of nebulae by increasing contrast and darkening the background sky, as well as reducing the effects of natural and artificial light pollution. Each filter is mounted and comes with a case for storage and transport. Center wavelength values: H-alpha 656.3nm, OIII 500.7nm, SII 672nm.Ha Filter The H-a 5nm is an extremely narrow emission-line filter that works by allowing a 5nm 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.SII Filter The Sulfur II extra narrowband filter transmits a 5nm 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. This SII filter also blocks infrared wavelengths from 700nm to 1100nm, so you don't need a separate IR-Cut filter.OIII Filter The Oxygen III extra narrowband Filter transmits a 5nm bandwidth of light that is centered at 500nm and drastically reduces other transmissions, including wavelengths that are responsible for light pollution. This filter also blocks infrared wavelengths from 700nm to 1100nm.