Optolong L-eNhance Filter - 2"

The Optolong 2" L-eNhance is a dual-band pass filter that effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines to achieve a maximum transmission of up to 90%. The performance of this filter delivers results that control the impact from light polluted skies in a major way.

 Technical Data

• Substrate:  B270
  
• Thickness:  1.85 mm
  
• Surface Quality: 60/40 (Refer to MIL-O-13830)
  
• Fine-optically polished to ensure accurate 1/4 wavefront and < 30 seconds parallelism over the both surfaces
  
• Tpeak:  T>90%
  
• Blocking Range:  300 nm - 1000 nm
  
• Blocking Depth:  Light pollution line blocking >99%
  
• Parallelism: 30s
  
• Multi-layers of anti-reflection coating