The Witch Head Nebula (NGC1909)
I took this picture for the first time in several years.
I think that adjusting the contrast between the pale witch's profile and the interstellar clouds of Ha in the background is an incredibly difficult target (for me...)
Since I shot with OSC, the NarrowBand is a Frame of Ha+Oiii, and at first I was planning to extract only Ha and put it in the background, but when I tried extracting Oiii as well, I found that there was a lot of Oiii in the witch's face, so I blended Oiii into RGB, and it turned a pale blue-green, which I think makes it look more witch-like.
I think that adjusting the contrast between the pale witch's profile and the interstellar clouds of Ha in the background is an incredibly difficult target (for me...)
Since I shot with OSC, the NarrowBand is a Frame of Ha+Oiii, and at first I was planning to extract only Ha and put it in the background, but when I tried extracting Oiii as well, I found that there was a lot of Oiii in the witch's face, so I blended Oiii into RGB, and it turned a pale blue-green, which I think makes it look more witch-like.
淡い魔女の横顔と背景のHaの星間雲とのコントラストの調整がめちゃくちゃ難しいTargetだと思う（自分では、、、）
OSCでの撮影のためNarrowBandはHa+OiiiのFrameになるが、最初はそのうちのHaだけを抜き出して背景に入れ込む予定だったが、試しにOiiiも抜き出したら魔女の顔の部分にかなりOiiiが含まれてるのが判った、よってOiiiをRGBにブレンドして見たが、淡い青緑になり魔女っぽさが増した気がする。
Place: Astropical@CSky Observatory (Bortle Class 3, Moon Phase 2%)
Shot1 Date:29th / Dec / 2024 20:43 (UTC+7)
William Optics Z61 WIth JSSS (61mm F/5.9 f/360mm)
Filter: Optolong L-Ultimate, Baader SemiAPO
L-Ult: 12X 600Secs Total 120 minutes
SmiAPO: 48X 300Secs Total 240 minutes
Total 6 Hours
Star RGB
CCD: QHY294C Pro 11Mega Mode BIN1
Mount :iOptron CEM70G
Guide: OAG Z61 61mm F/5.9, QHY290C.
Controler: NINA Dither, PHD2
Pre-Processing APP Drizzle None
Post-Processing PI,PS (North-Bottom)
Shot By Taro Seki Astropical.uk
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