I came across a review from B&H Camera of 9 different light pollution
filters. This review is of the screw in filters to be mounted on the front
of a camera lens. However, there is some good discussion of characteristics
and strengths/weaknesses of different brands that may apply to light
pollution filters for telescopes. I hope it helps.
https://www.bhphotovideo.com/explora/photography/hands-on-review/9-light-pol
lution-filters-tested-do-they-really-work?utm_medium=Email%201705796
<https://www.bhphotovideo.com/explora/photography/hands-on-review/9-light-po
llution-filters-tested-do-they-really-work?utm_medium=Email%201705796&utm_ca
mpaign=Content&utm_source=WeeklyContent%20190113&utm_content=Retail&utm_term
=9-light-pollution-filters-tested-do-they-really-work&encEmail=11A1AD6672BA7
A643B95666C3A45C3F7727D7BED8DFD458DCB0EBE11EE961520>
&utm_campaign=Content&utm_source=WeeklyContent%20190113&utm_content=Retail&u
tm_term=9-light-pollution-filters-tested-do-they-really-work&encEmail=11A1AD
6672BA7A643B95666C3A45C3F7727D7BED8DFD458DCB0EBE11EE961520
Rob
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