Svbony SV227 SHO 5nm 1.25" Filter Set SII H-Alpha OIII Narrowband Filters for Deep Sky - W9187A

• The Narrowband OIII 5nm filter is designed for nebula observation allowing 5nm bandwidth of light centered on a wavelength of 500.7nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, high- and low-pressure sodium vapor lights and the natural light caused by neutral oxygen emission;
• The H-Alpha 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;
• The SII 6.5nm 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. Due to the narrow bandwidth and high transmission rate of this filter, you will experience a major boost to contrast;
• The Blocks infrared wavelengths from 700nm to 1100nm so you don't need a separate IR-Cut filter, suitable for used for deep sky photographic and all are NOT for use on the Sun; 90% transmission of the filters can block the light from mercury and sodium vapour lamps; Standard M28.5x0.6 thread interface, can de directly into the 1.25 inch barrel of your telescope eyepiece.

Feature

1. Optical high precision double sided polishing to ensure that the parallelism is higher than 30 inch and high flatness 1/4λ; to ensure that does not affect the image quality
2. Precision double sided optical coating; non two piece glue; effectively improve the transmittance and cut off depth
3. 300-1000nm wavelength range; Oxygen III 5nm extra narrowband filter transmits a 5nm bandwidth of light that is centered at 500.7nm
4. Standard 1.25 inch interface; thin metal cells have a clear aperture of 26mm for 1.25 inch filters
5. 300-1000nm wavelength range; the Sulfur II 5nm extra narrowband filter transmits a 5nm bandwidth of light that is centered at 671.6nm

 

 

Cut-off Depth ≥OD5

With a Cut-off Depth ≥OD5, the SV227 1.25 inch narrowband filter set can effectively block unwanted light, ensuring pure and clear stargazing.

 

Package Includes

1.25-inch H-alpha Filter x1
1.25-inch SII Filter x1
1.25-inch OIII Filter x1
PP Storage Cases x3

 

Brand	SVBONY
Product Name	SII & OIII & H-Alpha Filter
Model	SV227
SKU	W9187A
Spec	5nm
Size	1.25-Inch
Transmission Line Wavelength	500.7nm & 656.3nm & 671.6nm
Peak Transmission Rate	T ≥90%
Wavelength Range	300-1000nm
Blocking	OD5 @300-1000nm
Clear Aperture	26mm
Surface Quality	60/40
Surface Parallelism	1/4λ
Cut-off Depth	Average ≥ OD5
Parallelism	30"
Thread Size	M28.5x0.6
Thread Type	Single thread / Male thread
Net Weight	140g
Substrate Thickness	1.85mm
Surface Treatment	CNC / Black Anodized
Material	6061T Aluminum Alloy
Net Weight per Piece	15g
Filter Diameter	Φ31.75x7mm