SVBNOY SV227 H-Alpha 5nm 2" Filter Narrowband Astronomical Photographic CCD Filter

for Deep Sky

The SVBONY 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. 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. This H-Alpha filter also blocks infrared wavelengths from 700nm to 1000nm so you don't need a separate IR-Cut filter.

Please Note: This h-alpha filter is NOT for use on the Sun.

Specifications:

• Brand: SVBONY
• Model: SV227
• Size: 2-Inch
• Substrate Thickness:1.85mm
• Clear Aperture: 44mm
• Wavelength Range: 300-1000nm
• CWL: 656.3nm 
• FWHM:  5nm
• Blocking: ≥OD5
• Peak transmittance: ≥90%
• Surface Quality: 60/40
• Surface parallelism: 1/4λ
• Thread: M48x0.75
• Single Thread: Yes
• Net Weight: 12.5g / 0.44oz /0.027lb

Package Includes:

• SVBNOY 2" H-Alpha 5nm 
• PP Material Plastic Box