I've written about my thoughts concerning LPR filters before...in some other threads
In summary:
Do they work? ...yes they do, they will filter/or block light from streetlights etc. They are an improvement on no filter but getting out of town is much better.
Will they make your backyard a great place to view? ...no, not if you are looking for faint fuzzies...double stars, planets, the moon will be great, but you don't need a filter for those anyway...
Would I advocate buying one? ...I own one and it works (improves the ability to see certain objects) but I don't think I would encourage people to run out and get one. If you are in need of a filter I would suggest the DGM Optics NPB (narrow passband) filter...it is a cracker! It is more than a LPR...
The other related issue that was mentioned earlier is that one of the horrible things about light pollution is that your eyes never get a chance to fully dark adapt. Even with your filt filtering/reducing some of the unwanted light, everytime you raise your head up from the eyepiece, your eyes will respond to the light. A towel over your head at the eyepiece will help but eventually stray light will hit your eye and you lose your dark adaptation in a snap...
Good Luck!
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