Svbony SV220 7nm Dual-Band Nebula Filter SII & OIII

The SV220 SII & OIII 7nm is a Duo Band Filter. It is designed to be used in combination with the SV220 H-Alpha & OIII Duo Band Filter to provide a superior method for achieving the SHO (Hubble Pallet) narrow band colour balance with colour imaging cameras. The SII and OIII Filter provides the missing band data so that owners of colour cameras can achieve the SHO colour balance in their narrow band images. The Duo-band filter (SII+OIII) has a high transmission of over 85% at its center wavelength (500.7nm and 672nm). It can effectively improve the quality of the image by making the sky background of the image darker while maximizing contrast throughout the image and enhancing the contrast of your pictures, thus making it easier to display the details of the stars. In areas with very serious light pollution, this filter can also selectively filter light pollution.

1.25inch SII+OIII Dual-Band Filter

2 inch SII+OIII Dual-Band Filter

Technical Specifications

Parameter	2-Inch Specification	1.25-Inch Specification
Model	SV220	SV220
Name	SII & OIII Duo-Band OSC Filter	SII & OIII Duo-Band OSC Filter
Size	2-Inch	1.25-Inch
Substrate Thickness	1.85 mm	1.80 mm
Clear Aperture	44 mm	26 mm
Wavelength Range	300–1000 nm	300–1000 nm
FWHM	7 nm	7 nm
Blocking	≥OD5	≥OD5
Peak Transmittance	≥88%	≥88%
Surface Quality	60/40	60/40
Surface Parallelism	1/2λ	1/2λ
Thread	M48x0.75	M28.5x0.6
Single Thread	Yes	Yes
Net Weight	15–20 g	7 g