星軌拍攝技巧 數問 - 

1).數碼機因hot pixel而唔適合曝得耐...最好分開影影夠幾個鐘...咁每張間隔之間都要俾CMOS斗下氣？
有師兄 教過 分十幾張 每張 10-20min 再合成 好過 一野 暴 幾粒鐘, (菲林 令計)

2).數碼機有D人話用ISO 100、有人話用ISO 400-800好...如果用合成方法...其實係咪都係就番光害而定...定係關雜訊事？
睇天氣 , 小弟 用 o個次 用 iso 100

5).北極星仰角澳門係23度，咁香港一樣？？
4季 都唔同 位置, 用星座 搵 會準確 d, e+ 係 冬季, 北極星 位置 係 獵戶座 (lei 個最易 認, 唔會 搵唔倒 ... ) 頭頂 (腰帶 致 頭頂 距離 再過 5倍左右)

附圖 係 舊年 去雲南 香格里拉 時影, 本泥想 長暴, 不過 o個晚 太涷 個人 頂唔順 要收皮 反酒店 

http://www.dchome.net/viewthread.php?tid=798154

With a lot of information, 香港的星空 — 觀測及拍攝資訊 - http://www.dcfever.com/column/read.php?id=1829 

Herman's articles at dcfever - http://www.dcfever.com/column/info.php?id=185

500px tutorial - http://500px.com/blog/738/tutorial-photograph-the-night-sky

About Comet - http://www.dcfever.com/column/read.php?id=2193

Atmospheric optical phenomena 大氣光學現象 - http://matthew-chin.blogspot.hk/2016/06/atmospheric-optical-phenomena.html

Stars & Night Sky - http://www.mikkolagerstedt.com/blog/2013/11/5/top-5-tips-to-photograph-stars-night-sky

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這張是11月15日凌晨拍攝的M42獵戶座星雲, 大埔的光害較嚴重, 所以要加上IDAS V4濾鏡作長時間曝光, 分三段不同時間曝光及作Layer Masking 處理, 把動態範圍拉闊. 在月光的影下算是滿意, 希望之後可以分數晚作10小時以上的曝光並加長每一張frame 的曝光時間 (現在是5分鐘一張), 使到暗位的表現進一步改善.

Place: Tai Po
Date: 14 Nov, 2013 (UT)
Camera: Canon 20Da
Lens: Canon EF-600 F4L
Mount: Vixen Sphinx with Star Book
Filter: IDAS V4
Exposure: 10 sec x 10, 30 sec x 10, 300sec x 26
ISO: 800
Guiding: Borg 60mm telescope, AIS120MM, PHD guiding.
Image calibration: Dark x 20 (average) for each exposure, Bias x 16 (Median), Dark subtracted Flat field x 20 (Median)
Processing: DSS, PS: layer Mask, Cropped, curve, colour adjusted.

http://forum.hkas.org.hk/viewthread.php?tid=8009
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http://list25.com/25-amazing-things-found-in-space-that-resemble-things-found-on-earth/?view=all

how-to-find-the-milky-way - http://goldpaintphotography.com/2015/07/24/how-to-find-the-milky-way/

how-to-capture-sharp-star-photographs - http://www.mikkolagerstedt.com/blog/2015/11/10/how-to-capture-sharp-star-photographs

銀河 - 觀測和拍攝 - http://matthew-chin.blogspot.hk/2016/06/blog-post.html

簡易四步驟處理高清銀河 - http://www.dcfever.com/column/read.php?id=3278 TimeLapse-AfterEffects特效『星流跡影片』-進階 - http://www.dcfever.com/column/read.php?id=3935

500 rule:
11mm: 45.5 seconds
12mm: 41.7 seconds
14mm: 35.7 seconds
16mm: 31.3 seconds
18mm: 27.8 seconds
20mm: 25 seconds
24mm: 20.8 seconds
28mm: 17.9 seconds
35mm: 14.3 seconds
50mm: 10 seconds
85mm: 5.9 seconds

http://www.price.com.hk/news.php?sec_id=12&id=7216

How to find constellations: a starter’s guide - http://www.zmescience.com/other/feature-post/starter-guide-constellations

http://www.deepskycolors.com/archive/2017/07/07/5-Milky-Way-Photo-Concepts-You-May-Wan.html

【星空系列教程】銀河及地景拍攝技巧
https://digiphoto.techbang.com/posts/9711-pre-planning-is-a-successful-shot-to-ensure-the-star-series-tutorial-on
https://digiphoto.techbang.com/posts/9712-star-series-galaxy-and-landscape-shooting-techniques-middle

Informaton of light pillar - http://www.islandnet.com/~see/weather/eyes/pillars.htm

How to take Lightning photos - http://www.dcfever.com/column/read.php?id=2456

How To Master Night Sky Photography - https://www.lightstalking.com/night-sky-photography/

How to Photograph the Northern Lights (Aurora Borealis)? - https://www.mikkolagerstedt.com/blog//how-to-photograph-the-northern-lights-aurora-borealis

4 Easy Steps to Edit Astrophotography in Lightroom - https://www.mikkolagerstedt.com/blog/how-to-edit-astrophotography-in-lightroom

Orion and the Aurora: how to photograph these wonders of the winter night sky - https://www.dpreview.com/articles/5435539340/orion-and-the-aurora-how-to-photograph-these-wonders-of-the-winter-night-sky