I had bought the filters in hopes to see more detail on the moon during a full moon. This was also to the "Crescent" very reliable and has given me a better recognition of Crater allows! For too far advanced lunar phase to the full moon darkening of the filter was very low and therefore the moon is still too bright to explore! For planetary observing minimal recorded to no change (tested on Jupiter moons + 4). Conclusion, the filter is processed in a very high quality and are more details on the moon can be seen, but he is too weak to darkened in very advanced phases of the moon, and thus not quite as recommendable for full moon observation (tested on Bresser Refractor 127/1200)