以管窺天集：M101

[willis]

再上地球本影。

[社長]

在我的顯示屏看，兩旁的月亮是黃綠色的?

[willis]

那應該是HDR做成的Artifact。剛貼出來的地球本影月蝕相，就沒有作銳利化和HDR，應該比自然。

[社長]

HDR會把外面的月亮變成黃綠色? 至少這色調也不正常? 你看生光及食既兩個，近地影邊緣那部份也是白，按理應全部一致好一些?

[willis]

十月頭一連幾天晴天，可惜全是返工日子，而且大把工作要跟，日日都非常攰！但又有新器材想試，硬著頭皮早去早回！好彩成功測試了！在北潭涌拍下面紗星雲的測試照。

This image, Veil Nebula, was imaged at Pak Tam Chung, Hong Kong.
Date: 4/10/2018
Location: Pak Tam Chung, Hong Kong
Equipment: Borg 107FL with Borg 7704 @F3.6, Nikon D810A, Sky Watcher EQM-35, STC Duo Narrowband, MGEN
Photographic details: ISO 1600, 5 mins x 17, flat frames, dark frames, bias frames
Post-processing: PixInsight

[willis]

哈勃風格的面紗星雲。利用PixInsight處理之前單反的面紗星雲數據，試玩玩哈勃風。

[willis]

好一段時間沒在香港以外的地方作天文攝影。甚至在香港拍攝的機會也很低。十月初廣東出現一片廣闊的晴空。我快閃到廣州山區，上天眷顧整晚都高清！享受了一晚繁忙的拍攝！回家後一直工作繁忙，為免最後不了了之，只能強迫自己快快出相！

Date: 6/10/2018
Object: Elephant's Trunk Nebula IC 1396
Location: Guangzhou, China
Equipment: Borg 107FL with Borg 7704 @F3.6, Nikon D810A, AVX, UV/IR, MGEN
Photographic details: ISO 1600, 5 mins x 21, flat frames, dark frames, bias frames
Post-processing: PixInsight

[社長]

哈勃風格的面紗星雲。利用PixInsight處理之前單反的面紗星雲數據，試玩玩哈勃風。

Hubble Palette 的顏色應是這樣的?

http://www.astro.hk/pages/photo/types/1/id/29

[willis]

因為不是真正的哈勃色，在PixInsight而言只是數學遊戲，有幾似就要睇玩得幾假！等我再努力玩假啲！

[willis]

快閃到廣州山區，第二張作品，日本人虛構M78為光之國，鹹蛋超人的家鄉。M78位於獵戶座，周圍雲氣迫人，還有巴納德環和其他深空如NGC 2112和LDN 1622暗星雲等， 給人的感覺非常璀璨。

This is my second deep sky photo imaged in my quick trip to the mountain area of Guangzhou last month. Japanese fictionally named M78 as the Country of Light, the hometown of Superman, in The Superman Overlord Series. The M78 is located in Orion, surrounded by nebulosity, the Barnard ring and other deep sky objects such as NGC 2112 and LDN 1622 Dark Nebula, which are very resplendent!

Date: 6/10/2018
Object: M78, NGC 2112, LDN 1622
Location: Guangzhou, China
Equipment: Borg 107FL with Borg 7704 @F3.6, Nikon D810A, AVX, UV/IR, MGEN
Photographic details: ISO 1600, 5 mins x 34, flat frames, dark frames, bias frames
Post-processing: PixInsight, PhotoShop

[社長]

個人風格不同。

我較傾向柔和一點。

[willis]

Time is always limited! I went Gemini Observatory in Lijiang, Yunnan, China, this Chinese New Year. Without much preparation, the trip was tough, but enjoyable. However, I don't have enough time to process the images. I only processed these two after more than a month.

時間總是有限的！沒有多準備的情況下，我在農曆新年去了雲南麗江的雙子座天文台。這次旅程不易，但很有樂趣。開學後一直很忙，一個多月了只處理了兩張照片。

Date: 8-13/2/2019
Location: Gemini Observatory, Lijiang, Yunnan, China
Post-processing: PixInsight

Image I: Region between Auriga and Taurus 禦夫座與金牛座之間的天區
Equipment: Sigma 135/1.8 @F5.6, Nikon D810A, HEQ5Pro, MGEN
Photographic details: ISO 3200, 5 mins x 26, flat frames, dark frames, bias frames

Image II: Unchained Galaxies 無束縛的星系
Equipment: Borg 107FL with Borg 7704 @F3.6, Nikon D810A, EQM-35, MGEN
Photographic details: ISO 3200, 5 mins x 66, flat frames, dark frames, bias frames

[willis]

The SH2-308 is one of my favorite deep sky object which is hard to be imaged by DSLR in Hong Kong. I finally captured it during the Chinese New Year Trip to Gemini Observatory in Lijiang, Yunnan, China.


SH2-308是我最喜歡的深空天體之一，在香港很難用DSLR拍到的。終於給我在新年于雙子天文台之旅捕獲了！


Date: 8-13/2/2019
Location: Gemini Observatory, Lijiang, Yunnan, China
Equipment: Borg 107FL with Borg 7704 @F3.6, Nikon D810A, STC Duo-Narrowband, EQM-35, MGEN
Photographic details: ISO 6400, 10 mins x 32, flat frames, dark frames, bias frames
Post-processing: PixInsight

[willis]

Space Moth 宇宙飛蛾
I don't go imaging abroad often. Whenever I go good observation sites, I wish to capture something difficult. Perhaps NGC 2170 is quite difficult for mobile astrophotography. This is another difficult target I captured during the Chinese New Year Trip to Gemini Observatory in Lijiang, Yunnan, China.

我不常到外地作天文拍攝。但每當我去到天空質素佳的觀察點，我都希望挑戰一些較難的深空。對於打游擊式的天文攝影而言，NGC 2170可不是簡單任務。這是今次雲南麗江雙子座天文台之旅的開心收獲！

Date: 8-13/2/2019
Location: Gemini Observatory, Lijiang, Yunnan, China
Equipment: Borg 107FL with Borg 7704 @F3.6, Nikon D810A, Sightron QUAD BP, EQM-35, MGEN
Photographic details: ISO 3200, 10 mins x 21, flat frames, dark frames, bias frames
Post-processing: PixInsight

[willis]

This was the first time I travelled to Australia with my family. The itinerary was so fruitful that it was impossible for me to go stargazing and capture images of the night sky on my own. Luckily the hotel I was staying in Gold Coast featured with a patio facing south, which allowed me to do some casual astrophtography.
Due to the serious light pollution in the city of Gold Coast, Pole Master was useless and Octans could not be found at all!
Finally, by using drifting alignment I achieved that a 300mm prime lens for imaging two minutes without star elongations, and then MGEN was adopted for auto guiding afterward. Although the environment was not too good, I earned an experience in astrophotography in the southern hemisphere.

Photographic details: Nikon D810A, Nikon AF-S 300/4, IDAS NB1, K-Mini (Kong Gor's DIY harmonic drive mini equatorial mount), ISO 3200, 10 mins x 5

第一次和屋企人去澳洲，日玩夜玩！根本夜晚冇可能再獨自出外攝星， 幸好去到Gold Coast的酒店有露台而且向正南，就是這樣在Gold Coast的市中心做了一些簡單拍攝。 雖然Gold Coast市中心光害嚴重，有Pole Master都無用，根本找不到 Octans！最後用Drifting達到300 mm兩分鐘內沒有拉線的情況，然後再用MGEN作 auto guiding， 雖然環境不算太好，但都叫做在南半球影過星。

拍攝資料： Nikon D810A, Nikon AF-S 300/4, IDAS NB1, K-Mini （光哥 DIY 諧波小型赤道儀）, ISO 3200, 10 mins x 5

[willis]

Both Small Magellanic Cloud and Large Magellanic Cloud are the all-time favorites in southern hemisphere. I was lucky enough to image them in this Australia trip. I posted the Large Magellanic Cloud about three weeks ago. Here is the Small Magellanic Cloud.

Photographic details: Nikon D810A, Nikon AF-S 300/4 @F5.6 , IDAS P2, K-Mini, ISO 1600, 17 mins x 5

大麥哲倫星系和小麥哲倫星系是南半球的熱門深空星體。與家人去澳洲，能在晚間拍攝的機會其實不多，我非常幸運可以一次過把這兩個深空星體拍下，非常興奮！早前已把大麥哲倫星系處理完畢，現在就是小麥哲倫星系了。

拍攝資料： Nikon D810A, Nikon AF-S 300/4 @F5.6, IDAS P2, K-Mini, ISO 1600, 5 mins x 17

[willis]

Fighting Dragons of Ara宇宙戰龍，NGC 6188，是我在澳洲拍攝的最後一個深空天體。儘管在香港夏季的晚上，戰龍雖然在地平線之上，由於牠只稍高於地平線再加上香港的光害，在香港很難拍攝到戰龍的。終於我在黃金海岸把牠捕獲！我用了兩種方式處理牠。 一種是常規的顏色，另一個是仿哈勃色。我稱他仿哈勃色是因為原數據是單反的RGB不是窄頻數據，只是用Pixel Math的方法去模仿哈勃色。點都好，給我一些意見，您最喜歡哪一個？
拍攝資料： Nikon D810A, Nikon AF-S 300/4 @F5.6, IDAS NB1, K-Mini, ISO 3200, 10 mins x 18

[willis]

The Squid in Fire (beta version)

After about 10 years of mobile astrophotography, I step into the era of remote observatory astrophotography. As a trial, I started everything in budget. I sent those less frequently used equipment I owned to a remote observatory in China, Gaoyazi Observatory. Gaoyazi Observatory is a less popular observatory in China and the management fee is less expensive. However, according to the meteorological data, the clear sky rate is high. This is the prime reason that I choose Gaoyazi Observatory. In order to test the sky quality of Gaoyazi Observatory, I deliberately choose a faint object OU4.
The learning curve of handling remote observatory for astrophtography is steep. It is somewhat different from mobile astrophotography. Luckily I have a long term photography buddy Allen walks with me. We conquer those technical problems one by one. No need to mention the remote control part, as a long time DSLR astrophotographer, using remote observatory and cooled mono camera etc. is a new challenge. After processed it for more than one week, I found it there were lots of technical problems for a newbie in this area. I found that the experience in processing astro-photos in a highly light polluted city, Hong Kong, is beneficiary. Although the sky quality of Gaoyazi Observatory is high, the amp glow and pattern noise are huge when imaging extremely faint objects. As a result, the S/N is low for OU4. In addition, the relatively high flat field requirement for mosaic, how to blend narrow band data together to form a color image etc. are non-trivial topics for me. Finally, I make this first light image, The Squid in Fire (beta version).

Location: Gaoyazi Observatory, Dabancheng, Xinjiang, China
Photographic details: 2 Panels Mosaic, (Ha + OIII) 24hrs, Skywatcher 120ED, Skywatcher 0.85x, QHY 163M, QHY 7 filter wheel, Optolong LRGB and SHO filter set, QHY OAG, Skywatcher EQ6, ZWO ASI 120MM Mini guider
Post-procoessing: PixInsight

「烈焰中的烏賊」beta版
經過了大約十年打遊擊式的天文攝影，現在正式邁向遙控天文台的時候。以試試的心態，在有限的資源下，我把一些我在香港較少用的器材送到新疆一個較少人認識的天文台，作為天文拍攝的儀器。在中國內地來說，高崖子天文台不是一個很有名的天文台，但勝在租金較平，而且根據氣象數據晴天率也算高，於是就選擇落址於高崖子。為了測試高崖子的夜空質素，我選擇了一個非常暗的深空OU4作為首次的目標。
其實玩遙控天文台要克服很多技術困難，它和打遊擊式的天文攝影有很多不同之處，幸好我有一位認識多年的攝影好友Allen和我並肩作戰，把一個一個的困難慢慢克服。
先不說搖控的困難，用了單反多年，使用冷凍的相機對我來說是一個新的挑戰！在後製時發現要面對的問題並不簡單, 我用了超過一星期的時間來處理，幸好的是以往在香港這高光污染的地方拍攝，已掌握不少的天文攝影技巧，例如處理噪音等。雖然高崖子天文台的星空質素很高，但是在處理一些極暗的深空時，S/N也不是相對地低，再加上Moasic對平場的要求較高和如何把narrowband data合成彩色相等對我來說都是新事物。經過一番努力之後，我終於把首張利用搖控天文台打下的深空照片「烈焰中的烏賊」beta版完成。

地點：中國新疆達坂城高崖子天文台
拍攝資料：兩張併圖, (Ha + OIII) 24hrs, Skywatcher 120ED, Skywatcher 0.85x, QHY 163M, QHY 7 濾鏡輪, Optolong LRGB and SHO 濾鏡, QHY OAG, Skywatcher EQ6, ZWO ASI 120MM Mini 導星相機, (Ha + OIII) 24hrs
後製：PixInsight

[社長]

Your best photos ever!

[willis]

The Ghosts of Cassiopeia
This is my first light image of Gemini Remote Observatory. The ghosts of Cassiopeia, IC 63 and IC 65, are cute and magnificent! The ghosts are flying toward the bright star.

仙后的哇鬼
這個是我在雲南麗江雙子搖控天文台的開光照，仙后的哇鬼形態挺可愛，IC 63和IC 65有點像尖頭版的Q太郎，正在奔向一顆亮晶晶的星星。

Date: Dec 2019
Location: Yunnan Li jiang, Gemiini Remote Observatory
Photographic Detail：HaLRGB 19.6 hrs, RC8, CCDT 67, Atik 16200, Skywatcher AZEQ 6
Post Prcoessing: PixInsight