• Built to Last: It is made of quality material, which is durable to use for a long time. providing good performance and durability
• Emission-line Filter: This 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
• 300-1000nm Wavelength Range: It blocks infrared wavelengths from 300nm to 1000nm so you don't need a separate IR-Cut filter. Due to the narrow bandwidth and high transmission rate of this filter, you will experience a major boost to contrast (Not Suitable for Use On the Sun)

Specification:

• Size: 2-Inch
• Substrate Thickness: 1.85mm
• Clear Aperture: 44mm
• Wavelength Range: 300-1000nm
• CWL: 672nm
• 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