Optolong L-Pro Light Pollution Telescope 2" Camera Filter

  • Optolong L-Pro filter is perfect for astrophotographers fighting light pollution
  • Best used for imaging most emission nebulae, reflection nebulae, and dark nebulae
  • Suitable for both visual photographic observations
  • Effective in suppressing light pollution sources 
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  • Regular price $199.00

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Optolong L-Pro Light Pollution Telescope 2" Camera Filter

The Optolong L-Pro filter (2 inch version) is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lights including mercury vapor lamps, both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Together with the highly transparent in main nebula emission lines at OIII (496 nm and 500 nm), H-beta (486 nm), NII (654 nm and 658 nm), H-alpha (656 nm), as well as SII (672 nm), the filter is suitable for enhancing the contrast and details for both visual and photographic purpose at sub-rural area with heavy light pollution.

Unlike other light pollution filter UHC and CLS, L-Pro is 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 to broadband emission objects such as galaxies, reflection nebulae and globular star clusters. L-Pro is the best choice for light pollution suppression.

Compare the L-Pro, L-eXtreme, and L-eNhance filter transmission lines:

Optolong L-Pro Light Pollution Telescope Camera Filter - Nikon-FF Clip-transmission-01

Optolong L-Pro Light Pollution Telescope Camera Filter - Nikon-FF Clip-transmission-0

Optolong L-Pro Light Pollution Telescope Camera Filter - Nikon-FF Clip-transmission-0

Click on the Gallery tab thumbnail images to see the transmission lines in greater detail.


Main Use and Performance

  • Fits with CCD and DSLR cameras
  • Works well on most emission nebulae, reflection nebulae and dark nebulae
  • Suitable for visual observation and astrophotography
  • 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.
  • L-Pro filter alone suppresses infrared wavelengths, and thus can be used at ease for "L" image shootings with CCDs
  • Light pollution filters do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.
  • Manufacturer's WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.


Image 1 (Left) shows The Orion Nebula after 1.9 hours of data with the L-Pro filter.

Image 2 (Center) shows The Orion Nebula after 180 seconds at ISO1600 with the L-Pro filter..

Image 3 (Right) shows The Orion Nebula after 180 seconds at ISO1600 with no filter. 


Technical Data

  • Schott substrate material
  • Thickness 2.0 mm (1.25-inch, 2-inch, and 77 mm)
  • Thickness 1.0 mm (Clip series)
  • 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 656 nm; OIII 496 nm, and 500 nm; SII 672 nm; and H-beta 486 nm)
  • Precision off-band blocking, specifically the major emission lines of artificial light pollution (i.e. Na 589 nm, Hg 435 nm and 578 nm)

Coating Parameter

  • Multi-layers anti-reflection coating
  • Non-cementing optical substrate coating
  • 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

Filter Cell

  • Ultra-thin filter cell minimizes vignetting by maximizing possible clear aperture (clear aperture is 26 mm for 1.25-inch; 45 mm for 2-inch)
  • Aerometal Material
  • Precise CNC Machining
  • Sand Blasting Process
  • Black Anodized Finish
  • Extinction Treatment to Prevent Reflection
  • Laser Engraving for No Fading 



BandpassMulti Bandpass
Filter Thickness2mm
Filter TypeLight Pollution/City Light Suppression
Free ShippingYes


Customer Reviews
5.0 Based on 10 Reviews
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Filter Reviews:
Jimmy F.
Optlong L-pro

I believe this filter to be a necessity when imaging through light pollution. I was able to capture the faint Triangulum Galaxy in my city light polluted backyard with 4 min exposures. I’m amazed at what this filter can do and look forward to many more faint deep sky targets.

Kenn H.
United States United States
Optolong L-Pro Light Pollution Telescope 2" Camera Filter

I previously owned two different Light Pollution filters, Orions' and Lumicon. The Optolong filter provides better contrast and I've gained a little more detail in what used to be washed out when using the other filters. I live in a Bortle scale of 8.

Maximilian H.
United States United States
Great product!

So far so good. Living in a Bortle 8/9 city this filter has allowed me to increase iso and exposure time significantly for DSO

OPT Telescopes

So happy to hear, Max! Clear skies!

Jon G.
United States United States
Excellent First Light...

Very pleased with my first result from light polluted fringes of San Diego using the Optolong L-Pro through my 72 mm refractor and ZWO ASI533MC Pro (also new from OPT). No comparison image without the filter, but, considering that you can only see a dozen or so stars in the entire sky from my backyard, this isn’t too bad. I annotated this image of M101 and its companion galaxies for my facebook friends.

Mike B.
United States United States
Optolong L-Pro light pollution filter (2")

I have neighbors with yard lights and sky glow from a city about 10 miles away. I have tried other CLS light pollution filters with some success. I heard about the Optolong L-Pro light pollution filter from some tutorials on you tube and other sources and decided to give it a try. I have had very good results including with a half moon very near my imaging area. My final images are sharp and detailed with good dark background sky.

Michael B.
United States United States
Great In light polluted areas

I live in a class 6 Bortle sky and this truly helps with my imaging. worth it.