The Optolong L-Pro EOS APS-C Clip is a multi-bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast on broadband emission objects such as galaxies, reflection nebulae and globular star clusters. 

Optolong EOS-C DSLR Clip In Filter is compatible with the following cameras:

• Canon Digital Rebel XS
  
• Canon Digital Rebel XSi
  
• Canon EOS 1000D
  
• Canon EOS 500D
  
• Canon EOS Kiss F
  
• Canon EOS Kiss X2
  
• Canon EOS Kiss X3
  
• Canon EOS Rebel T1i
  
• Canon EOS 60D
  
• Canon EOS 60Da
  
• Canon EOS 7D
  
• Canon EOS 70D
  
• Canon EOS 50D
  
• Canon EOS 650D
  
• Canon EOS 600D
  
• Canon EOS 550D
  
• Canon EOS 700D
  
• Canon EOS 1100D
  
• Canon EOS 1200D
  
• Canon EOS 40D
  
• Canon EOS 30D
  
• Canon EOS 20D
  
• Canon EOS 10D
  
• Canon EOS D60 
  
• Canon EOS D30
  

The Optolong L-Pro (L-Professional) Filter is designed to improve the visibility of various deep-sky objects by selectively reducing the transmission of light pollution wavelengths, specifically those produced by artificial means such as mercury vapor lamps, and both high & low pressure sodium vapor lights.  The Optolong L-Pro also reduces unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).

Together with the highly transparent main nebula emission lines at OIII (496nm and 500nm), H-beta (486nm), NII (654nm and 658nm), H-alpha (656nm) as well as SII (672nm), the filter is suitable for enhancing the contrast and details for both visual and photographic purposes with your compatible Canon EOS camera in sub-rural areas with heavy light pollution.

Main Use and Performance

The Optolong L-Pro filter has a very low transmission reduction rate against continuous spectrum space objects, and thus is quite effective in suppressing light pollution sources when shooting galaxies, reflection nebulae and globular star clusters. The same holds true for visual star observations. 

WARNING: DO NOT LOOK AT THE SUN WITH AN OPTOLONG FILTER. You could be BLINDED if you fail to observe the warning.

 Technical Data

• Optical glass fine material

• Spectrum: 380-750nm

• 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

• High transmission at major nebula emission lines (i.e. H-alpha 656nm, OIII 496nm&500nm, SII 672nm and H-beta 486nm).

• Precision off-band blocking, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm).