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 Rating0 Votes
0
Pros
Works reasonably well under all conditions tested
Good star color
Cons
Expensive for a light pollution filter
90
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