This group is all about imaging with narrowband or emission line filters. Many astroimagers live in areas that have significant light pollution. The use of narrowband emission line filters can help overcome the limitations of a bright sky allowing color images such as the one to the right to be taken from a light polluted backyard in a city.
When used to make color images, emission line data can highlight latent structural features in nebulae and give them a unique appearance. The advantages are not limited to color images, many beautiful images have been taken with just a single emission line filter such as Halpha.
The discussion topics of the group include anything relating to imaging with narrowband filters. Image postings are specifically encouraged as are discussion about processing techniques, hardware issues etc.
my comment relates to how to make full use of the color gamut available to you it is common to find Halpha many times more abundant in an object than [OIII] or
Richard, Thanks for the link to the article, it was helpful. One question about the histograms. You say that the histograms of the OIII and SII channels
you can send the raw files to me if you like. Â just the stacked and calibrated images, no processing other than flats/darks/biases. It makes it easier all
welcome to the group Joel. I tried to look at your images but they weren't loading. But let me say a few words that may be of some help: I wrote the original
Hello, I am new to this group, and am new to narrowband imaging. In fact, I'm working on my first narrowband image, a bi-color image of NGC6888 (Crescent