SVBONY Telescope Filter CLS EOS-C Clip-on Filter Compatible for Canon Broadband City Light Reduction Filter for CCD Cameras DSLR
- Electron beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching.
- as well as stability on CWL (central wavelength) no deviation affected by temperature change.
- Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off band.
- 90% transmission of main nebula emission lines.
- specifically the major emission lines of artificial light pollution.
- Urban optical filter can effectively suppress urban harmful light and improve the contrast of shooting target.