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
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