Astronomik CLS and packaging

Astronomik CLS

Formats

  • 1.25″ Mounted
  • 2″ Mounted (48mm threads)
  • T-thread cell (M42 thread with 0.75mm spacing)
  • SC-cell (2″ / 24TPI)
  • 31mm Unmounted
  • 36mm Unmounted
  • 50mm Unmounted
  • Canon EOS APS-C Clip-Filter
  • Canon EOS M Clip-Filter
  • Canon EOS XL Full Frame Clip-Filter
  • Canon EOS XL R Clip-Filter
  • Sony alpha Clip-Filter
  • Nikon XL Clip-Filter
  • Pentax K Clip-Filter

Spectral Transmission

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: 4.4mm; including threads: 6.84mm
  • 48mm threads
  • Minimal knurling only on top
  • Highly reflective interference filter

Real world tests

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, 18 min integration (6*180s)
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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, 16 min integration (8*120s)
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Reader Rating1 Vote
78
Pros
Available in many formats
Fair price
Cons
Middling star color
CLS concept outdated with move to LED streetlights
83
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