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  • Product Code: EOSRFF

OPTOLONG L-Pro Canon EOS-R 1mm Filter EOS R/Ra , EOS RP, EOS R5, EOS-R6


Optolong L-Pro (L-Professional) is a multi-bandpass filter which selectively suppresses the transmission of light pollution lines. For example, mercury vapor lamps, high and low pressure sodium vapor lights and skyglow caused by emission from neutral oxygen in our atmosphere.


L-Pro enhances the transmission of major emissions from nebula while offering great colour balance with its wide yet effective light pollution cutting transmission band. The balanced transmission allows objects with wide emission spectrum such as galaxies to be imaged with minimal colour cast (easier to correct in post-processing). Among the emission lines enhanced are OIII (496, 500nm), H-beta (486nm), NII (654, 658nm), H-alpha (656nm) and SII (672nm).  


Spectrum and Highlights

  • 90% transmission at major nebula emission lines
  • Multi-layers anti-reflection coating
  • Precise and sharp roll-off at light pollutant lines
  • 0.3 mm filter thickness for Lpro UT and 1 mm Lpro filter
  • Made on Schott substrate
  • Finely polished to 1/4 wave accuracy
  • Surface quality: 60/40 (MIL-O-13830 standard)
How to choose L-Pro UT & L-Pro?

  • L-Pro UT is same with L-Pro in manufacture process and coating technic that Tavg>90% in 380-750mm,
  • 90% light pollution is blocked;
  • L-Pro UT & L-Pro is suitable for Bortle 3-7 level;
  • You can choose L-Pro, if your lens which you often used for astrophotography is >24mm;You can choose L-Pro UT

Recommended applications

  • Monochrome & one-shot-colour CCD/CMOS camera
  • Deep sky colour imaging, particularly reflective nebula and galaxies

EOS-R Filter:

  • Campatible camera: EOS R/Ra , EOS RP, EOS R5, EOS-R6
  • Notice: we recommend you use 24 and >24mm above lens for better using experience.



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