Here I am today, after various trials, groped to write a satisfactory review of the Baader filter in question. I waited a bit before deciding to write a post, because I had not got to try it on a large number of objects deep and could not provide adequate feedback, but now, after using it on various subjects can say to be fully satisfied.
We start from the beginning, however, just open the plastic bag and examined the filter a bit, the first impression I had was reliable and well executed. Even comparing it eye and look toward the lights of home, you can indeed appreciate the quality. A defect that could possibly annoy those who use it do not screw the filter on the eyepiece, but positioned between the lens and the eye is that if you have behind you a strong source of light, the surface of the filter becomes similar to a mirror ... but in a place of observation, this is a condition hard to find, so ... Now to the actual test in the field. The first observing session after receiving the filter has been paid, as expected, to M42, the Great Nebula of Orion. Without the filter, in a wide-field eyepiece, the nebula was clearly visible with a color that it seemed to me green (some say it actually gray, but green and it seems to me enough! ) As usual, is easily noticeable even M43. With the filter on the other hand, the sky background was much, much darker, while the nebula was visible in a more extensive and M43 are also well noted, all clearly separated from the pitch black of the sky provided by the Baader UHC-S ( and as you can see from the chart above, it is quite generous).
The second test was always performed that evening, at the M1 and M78, respectively in Taurus and Orion. Both subjects were difficult to see without a filter, and passed almost unnoticed, if not done carefully, while looking with the filter, were both clearly visible and contrasted by a black sky, that resembled that seen in the mountains (although unfortunately it was just an illusion). The third test was conducted today on M57, the Ring Nebula in Andromeda and M31. The first, escaping without a filter, of course, was visible with the Baader UHC-S, even at high magnifications, even if more is going on with them, the more the image loses its brightness, especially with the filter, the observation of the second subject Instead, the Andromeda galaxy, has not undergone improvements (nor deterioration) , excluding the darkening of the sky background, with the UHC-S, as expected.
In conclusion, I think it's a good filter, and if your interest is in the deep sky, you definitely have it in your briefcase. The resulting image as you can see from the tests is excellent, you can see otherwise hidden details, see well and sometimes you have to watch something that no filter in averted vision. The only drawback is the low light loss, which is contraindicated due to go up a lot with the magnification, but miracles do not exist in this world ....
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