Visibility III / V
Finally clear weather and free time happened to be on the same day... It had already been a month since the last time. And next time, you may have to wait a long time due to school rushes and fall weather.
This image shows broadband data from three hours ago of nebulae in the constellation Cassiopeia/Cepheus. Next time, when it's clear and I have time to film, I'll have to try to film narrowband data for this. Now the mists are slightly covered by the stars.
I was surprised by how well I managed to bring out the mists of the area with only three hours of exposure. The picture had gradients and strange vignetting that were difficult to correct due to light pollution. Even flat photos did not correct this vignetting. I don't know what caused it. I have never noticed/experienced such a thing before. Difficult gradients, on the other hand, were handled by making several iterations with PixInsight's DBE tool. First with bigger dots and finally with smaller ones. In total, I had to repeat the DBE eight times. The eighth time was DBE for the starless image and finally I attached the stars back to the image.