H-Alpha 12nm filter for Canon EOS (M48)
- Compatible with all Canon EOS models
- Applicable to the Ha spectral emission nebula, can effectively improve the contrast of cloud
- Applicable to the darker Ha emission nebula, and is used in the heavy light pollutionarea
Technical data:
- Peak transmittance:Tmax @ 656 nm h-alpha light transmittance of more than 95%
- Half the bandwidth (FWHM) :12 nm
- The range (Blocking Area) :200-1100 nm
- Filter glass thickness:1.85 mm, ensure the 1/4 lambda high flatness optical processing
- Glass material: HB610 colored glass (similar to Germany short RG610),use of color glass absorb ultraviolet and visible light in front of the 610 nm, a more thorough as miscellaneous light interference.
- Surface finish:60/40 (the United States military standard MIL - O - 13830)
