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Bottom line - some improvement, but at a price. This is based on my limited usage so far. I live in a medium sky, surburban area with a sky Surface Brightness of 20.25 mag/arcsec2 sky, orange area on some dark-sky maps. It seemed like the ideal area to filter out mercury vapor or sodium lights and enhance contrast in my search for faint deep-space objects (dso's). For the most part, the filter makes things a bit darker and so far has not made these easier to see. I was able to see a member of the Veil Nebula, NGC 6995, with the filter that I had tried multiple times to see, unsuccessfully, without the filter with my 4" telescope . I'm looking forward to trying out the filter in darker skies. Form my reading on this filter, it may be more useful if you are using it for astrophotography rather than for plain seeing. The filter seems of good quality and I'm glad I have it but I would be much happier if I had paid $15 for it, not $50. Read full review
Verified purchase: Yes | Condition: New
This is a specific filter that you should use to filter out the light in the earth's ozone, in order to be able to see the nebulas more clearly. Upsides: increases nebula's image sharpness, downside: reduces the amount of light you can see, and it's suitable for 8" scopes and higher. Make sure your scope is colimated before using it.
Verified purchase: Yes | Condition: Pre-owned
Just what I was looking for to help with the light pollution around here
Verified purchase: Yes | Condition: Pre-owned
Unfortunately the clarity of most filters are over rated and this is quite expensive too.
Verified purchase: Yes | Condition: New
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