SVBONY SV227 2" SHO Telescope Filter Set, Narrowband Filter Kit, SII H-Alpha OIII 5nm Narrow-Band Filters, Reduce Light Pollution, 3Pcs Set for Emission Nebula Planetary Nebulae Astrophotography

SV227 2" Narrow-Band Filter is specifically designed for use with monochrome cameras in astrophotography; it effectively isolates the emission lines of certain celestial objects; enhancing image detail and contrast to make features more pronounced SII, H-Alpha, and OIII filters are narrowband filters commonly used in astrophotography and observations to capture specific emission lines from celestial objects Each filter of the SII, H-Alpha, OIII is individually tested and scanned to ensure that the quality meets the performance parameters Conventional narrowband filters cause a heavy loss in transmission due to the strong center wavelength (CWL)-shift; our filter can guarantee transmittance 2 inch mounted; the filter can thread directly into the 2 inch barrel of your telescope eyepiece