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Chris Sulyma - SeaWolf Astrophotography: andrea tasselli: @andrea tasselli is right. as always  Generally, the OIII signal is weak and requires longer integration to extract. This holds true even for mono cameras (or so I think). However, some targets, like planetary nebulas, may be richer in OIII than Ha.Among many other issues with all my images taken with L'ultimate is that in comparison to the red channel, my green and blue channels (OIII) are often very weak (for example: NGC1499 and IC 443). Because of this, color balancing, noise reduction, etc., degrade the overall quality of the image. Processing can only take you as far as your data allows. What is not there cannot be compensated for, no matter which tool you use. So for now, I am trying to improve my images simply by using the brute force method of longer integration and Zen-like patience.  |
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| ...you mean there's any other method? 🤣 |
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| Thank you to everyone who replied, lots of useful information! I travel to dark skies as often as possible, but want to practice and develop skills that can be applied when traveling. Your images have shown that it is possible to image from Bortle 8-9. |
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In the last year, I've experimented repeatedly with imaging in broadband from my Bortle 7 backyard. Just like Jon said, I find a luminance filter to be very useful. In addition to having to VASTLY extend the total integration needed to reach a given SNR, I feel that my main challenge in imaging from high-Bortle areas is building a good background model and removing gradients. A nasty gradient can make it almost impossible to reveal faint stuff like molecular clouds of dust. I had the best results when I could use wider-field reference imagery to apply Vicent Peris' multiscale gradient reduction, so I can't wait for the MARS project to make their ground truth data available to all of us PixInsight users. Here's some Bortle 7 LRGB images from the last year or so. I'm particularly happy with the Cocoon and the Gecko. https://www.astrobin.com/0hpqzd https://www.astrobin.com/qre25i https://www.astrobin.com/fqvjz6 https://www.astrobin.com/zxjxx2 https://www.astrobin.com/rfxb9n https://www.astrobin.com/qbzz65 https://www.astrobin.com/wrb5b1 |
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My answer is fast telescope and mono camera, if you want to do boardband. This m51 i took by hyperstar 8 under bortle 9 sky in minneapolis downtown.  |
