LPro with packaging

Optolong L-Pro

Formats

  • 1.25″ Mounted
  • 2″ Mounted (48mm thread)
  • M77 Mounted
  • Canon EOS APS-C Clip-in
  • Canon EOS Full Frame Clip-in
  • Nikon Full Frame Clip-in
  • Sony Full Frame Clip-in

Spectral Transmission

Optolong L-Pro Spectral Transmission Chart
Yellow line is published transmission. Color fill is my independent verification with the filter I tested. Note: I used a Quartz Tungsten-Halogen bulb which is broad spectrum, but does not have good throughput in the blues hence I only vouch for the accuracy of my independent verification from 500-900nm.

Physical Characteristics of 2″ filter

  • Filter mount thickness: above threads: 5mm; including threads: 6.78mm
  • 48mm threads
  • Minimal knurling only on top
  • Highly reflective interference filter
  • Inner retaining ring does have notches for easy filter disassembly with a spanner

Real world tests

Canon 5D photo of NGC7000
Bortle 4, Canon 5D mk iii (stock), AT60ED at f/6, ISO1600, 15 min integration (6*150s)
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Bortle 4, QHY168C, Cooled to -10C, AT60ED at f/6, Unity gain, 16 min integration (8*120s)
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Bortle 9, Canon 5D mk iii (stock), AT60ED at f/6, ISO1600, 10 min integration (20*30s)
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Bortle 9, QHY168C, Cooled to -10C, AT60ED at f/6, Unity gain, 15 min integration (10*90s)
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LPro with packaging
Optolong L-Pro
Reader Rating11 Votes
50
Pros
Works reasonably well under all conditions tested
Good star color
Cons
Expensive for a light pollution filter
90
Purchase from:
  1. Excellent information Nico. I bought the L-Pro in Spring 2020 but only used it a few times with my unmodded Canon T2i under bortle 6-7 skies (Baltimore suburbs). I found it difficult to color balance. I’ve since started using a ZWO ASI183MC-Pro and also PixInsight. I’m thinking I should give this another try. My next Project will be the Horsehead and Flame Nebula and I’ll be looking more toward the Baltimore light dome (also lower in the sky). Do you think this would help for this next target?

    One suggestion… add the images with and without filters shown in the video to this website. Unless I’m mistaken I only see the images with the filters. I’ve heard people rave about the Optolong L-Enhance.. any chance you’ll review that one as well?

  2. 98
    Unbias review and comparison shootout

    Excellent review and YouTube video. I love that you can clearly see the improvements the filters make in the YouTube video.

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  3. 50

    Thanks Nico,
    I really liked your comparison on YouTube. Would be helpful to have the side by side comparison on this page as well.
    CS,
    Phillip

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Final Score

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Light Pollution Filter Shootout