Product Description.
Spectral Curve
The Major Emission Lines of Nebulae:H-β486.1nm OIII 495.9nm OIII 500.7nm H-α 656.3nm
The Major Emission Lines of Artificial Light Pollution:Hg 435.8nm 546.1nm 577nm 578.1nm;Na 598nm 589.6nm 615.4nm 616.1nm
95% transmission of main nebula emission lines
0.1% transmission of off-band, specifically the major emission lines of artificial light pollution
Transmission of 0.1% is equivalent to OD3(Optical Density), and a high optical density value indicates very low transmission, and low optical density indicates high transmission.
Increases the contrast and image sharpness
--Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and optical density of off-band.
--Multi-layers anti-reflection coating can reduce the reflection and enhance the transmission of lights ;
--Ultra-thin filter cell minimize vignetting by maximize possible(clear aperture is 45mm for 2”);
--Electron-beam gun evaporation with Ion-assisted deposition coating technology (IAD) increase the stability of CWL (central wavelength) , no deviation affected by temperature change.
Durable
--Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching.
--the package box is plastic pp-case with high density sponge carton lining ,which makes the filter portable and easy storage
Package Includes:
1xSvbony 2inch CLS Filter 1xSturdy Plastic Case
Specifications:
Brand: Svbony
Type: City Light Suppression Filter (CLS Filter)
Material: Optical glass lens, Aluminum Frame
Thread: Standard M48x0.75mm
Net Weight: 5.2g / 0.18oz