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https://www.cloudynights.com/topic/46825-preliminary-test-of-uhclpr-filter-and-binocular/
Hi! I am a robot. I just upvoted you! I found similar content that readers might be interested in:
https://www.cloudynights.com/topic/46825-preliminary-test-of-uhclpr-filter-and-binocular/
RE: Light Pollution Filters and Giant Binoculars - Experiment and Results