The Full Moon beamed that clear night as I reminisced my time under starry skies. How I wished I was there at a dark hill with only starlight illuminating the sky! I reckoned that the closest to this astro-tripping was to do some exercises in image-processing. so, I brought out my previous capture files and decided to do some redux on the Crescent Nebula. I remembered that I acquired the subs at home and at Buso-buso. I again quickly did processing and compared the result with the previous I had. Well, slight improvement but an improvement nonetheless, enough to quench this astro-thirst at the moment.
6 comments:
Fantastic image! Are these the same data of your previous crescent nebula post? Thats a lot of nebulosity captured, do you use a modified dslr?
Thanks Leo! Yes, these were from the same data as before but this time I used a different technique in combining H-alpha with the color data. All subs were taken with a modified Canon 350D in which the front filter has been removed.
Thank you for sharing your amazing images.Mind if I bug you a bit for some advice?
I started to learn astro-imaging last feb, and I'm about to order some stuff, and I'm unsure weather to get the astronomik clip-on CLS or the narrower UHC filter. Until i saw your images I never thought H-alpha filters were effective for DSLRs. Now I'm also thinking about it.
Do you use only the red channel from the H-alpha filtered image then blend it with the red channel of the color data?
Hi Leo,
Its my pleasure to be of help! For a H-alpha filter to be effective, you need to remove the front filter of the stock dslr to increase its H-alpha sensitivity. Yes, you guessed it right. I only use the red channel of the H-alpha then mix it with the red channel of the color data. This new hybrid HaR data is then used as substitute for the Red channel. Then use the original H-alpha data as luminance on the new color data. So, the resulting image is a Ha-HaRGB. Feel free if you need more info.
So you use the H-a data as a luminance layer as well,no wonder your images looks so amazing!
Did you do the filter removal yourself and replace it with a UV/IR cut filter? Do you use any filter for your color data?
I've been seriously contemplating modding my camera as well,but i cant quite bring my self to commit to it yet.
Yes, I removed the filter myself and replaced it with the UV/IR cut-off filter. No additional filter for color data. There are plenty of web references for the DIY camera mod.
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