用單鏡反光機拍攝H-alpha太陽

Equipment (Solar) - 白光、H-Alpha、Cak光譜觀測及攝影器材

用單鏡反光機拍攝H-alpha太陽

文章

David » 2011-03-02, 21:44

用webcam拍攝太陽需要帶電腦和購買webcam,如果覺得不方便,用單鏡反光機拍攝的效果又如何?P-M Heden用單鏡機拍攝過不少精彩H-alpha相片:
http://www.clearskies.se/Gallery%20The%20Sun.htm

前數天我把Canon EOS40D接駁LS152T和B1800阻隔濾鏡,試試拍攝效果。鏡的口徑是152mm,焦距為900mm。

首先,我發現太陽表面圓盤上毛絨絨的細節在live view中幾乎完全看不到,如果沒有太陽黑子,是很難對焦的。我用ISO100拍攝,發覺曝光要1/10s才足夠。
附加檔案
IMG_0301_大小.JPG
IMG_0301_大小.JPG (100.28 KiB) 被瀏覽 30104 次
IMG_0302_大小.JPG
IMG_0302_大小.JPG (110.92 KiB) 被瀏覽 30104 次
IMG_0294_大小.JPG
IMG_0294_大小.JPG (164.26 KiB) 被瀏覽 30104 次
APM 80/480, SW 120mm Equinox, C8, Obsession 18"UC with Argo Navis & StellarCat
Lunt LS60T/CaK, LS152T with DSII
DMK31AF03, DMK21AF04, DBK21AF04
Mark V Binoviewer, Ethos (3.7mm, 6mm, 13mm), 19mm Panoptic, 5mm TMB mono
http://www.imsc.edu.hk/pages/astronomy
頭像
David
全域版主
 
文章: 1270
註冊時間: 2010-02-01, 19:33

Re: 用單鏡反光機拍攝H-alpha太陽

文章David » 2011-03-02, 21:45

一般來說,太陽邊緣日珥和太陽圓盤需要不同曝光時間。不過你也可以用只一張日珥曝光正常的相,然後用它的綠色通道作為太陽圓盤(可參考Sky & Telescope July 2004)。附圖為原相和處理後的圖,沒有疊相。
附加檔案
DSLR test.jpg
DSLR test.jpg (318.27 KiB) 被瀏覽 30103 次
unprocessed.jpg
unprocessed.jpg (108.9 KiB) 被瀏覽 30103 次
APM 80/480, SW 120mm Equinox, C8, Obsession 18"UC with Argo Navis & StellarCat
Lunt LS60T/CaK, LS152T with DSII
DMK31AF03, DMK21AF04, DBK21AF04
Mark V Binoviewer, Ethos (3.7mm, 6mm, 13mm), 19mm Panoptic, 5mm TMB mono
http://www.imsc.edu.hk/pages/astronomy
頭像
David
全域版主
 
文章: 1270
註冊時間: 2010-02-01, 19:33

Re: 用單鏡反光機拍攝H-alpha太陽

文章willis » 2011-03-02, 23:45

Thanks for sharing! It is not bad! Let me try it.
Tak FS60C, APM-LOMO 80/480, APM-TMB 105/650, SW Black Diamond 120ED, Borg 125SD, SW 12" Dobs , Lunt LS35T, Lunt LS80T
TMB Super Mono 4mm, Pentax XO 2.5mm, Baader Planetarium 8-24mm, Nagler (2-4mm, 3-6mm, 13mm), Ethos (3.7mm, 6mm, 10mm), Explore Scientific 100º (14mm, 20mm)
DBK 21, DMK 21, DMK 41, DMK 51, ASI 178MC
Nikon D810A, Canon 5D II, Fujifilm X-T10
頭像
willis
全域版主
 
文章: 1526
註冊時間: 2010-02-01, 17:50
來自: HK

Re: 用單鏡反光機拍攝H-alpha太陽

文章Robin » 2011-04-18, 01:38

DSLR需要更換原裝阻隔濾鏡嗎?
My blog: Astronomy Notes -- restoration in progress. :)
頭像
Robin
 
文章: 181
註冊時間: 2010-11-24, 16:22
來自: Kluang, Malaysia

Re: 用單鏡反光機拍攝H-alpha太陽

文章David » 2011-04-18, 09:28

Robin 寫:DSLR需要更換原裝阻隔濾鏡嗎?


No, the 40D I use is not modified.
APM 80/480, SW 120mm Equinox, C8, Obsession 18"UC with Argo Navis & StellarCat
Lunt LS60T/CaK, LS152T with DSII
DMK31AF03, DMK21AF04, DBK21AF04
Mark V Binoviewer, Ethos (3.7mm, 6mm, 13mm), 19mm Panoptic, 5mm TMB mono
http://www.imsc.edu.hk/pages/astronomy
頭像
David
全域版主
 
文章: 1270
註冊時間: 2010-02-01, 19:33

Re: 用單鏡反光機拍攝H-alpha太陽

文章shuimouzi » 2011-09-15, 22:06

David 寫:一般來說,太陽邊緣日珥和太陽圓盤需要不同曝光時間。不過你也可以用只一張日珥曝光正常的相,然後用它的綠色通道作為太陽圓盤(可參考Sky & Telescope July 2004)。附圖為原相和處理後的圖,沒有疊相。


请教David大侠,使用什么软件处理的?能说说过程吗??很有性趣 :)
頭像
shuimouzi
 
文章: 427
註冊時間: 2010-07-24, 15:15

Re: 用單鏡反光機拍攝H-alpha太陽

文章David » 2011-09-16, 09:20

shuimouzi 寫:请教David大侠,使用什么软件处理的?能说说过程吗??很有性趣 :)


I used photoshop. Please give me some time to write the steps. ;)
APM 80/480, SW 120mm Equinox, C8, Obsession 18"UC with Argo Navis & StellarCat
Lunt LS60T/CaK, LS152T with DSII
DMK31AF03, DMK21AF04, DBK21AF04
Mark V Binoviewer, Ethos (3.7mm, 6mm, 13mm), 19mm Panoptic, 5mm TMB mono
http://www.imsc.edu.hk/pages/astronomy
頭像
David
全域版主
 
文章: 1270
註冊時間: 2010-02-01, 19:33

Re: 用單鏡反光機拍攝H-alpha太陽

文章shuimouzi » 2011-09-17, 00:07

Thank U very much!! :)

But can U write the steps in Chinese ? :roll: If not , I must use the English-Chinese dictionary. :|
頭像
shuimouzi
 
文章: 427
註冊時間: 2010-07-24, 15:15

Re: 用單鏡反光機拍攝H-alpha太陽

文章Nebulas » 2011-09-17, 18:54

shuimouzi 寫:Thank U very much!! :)

But can U write the steps in Chinese ? :roll: If not , I must use the English-Chinese dictionary. :|


Usually, David's paper is very easy to read if you took your attention on it. :D
以前看书学天文,后来用望远镜学习天文,现在用纸笔想象天文!
頭像
Nebulas
 
文章: 1927
註冊時間: 2010-04-08, 12:36
來自: Wuhan, Hubei Province, P.R.China

Re: 用單鏡反光機拍攝H-alpha太陽

文章oldfield » 2012-02-04, 10:27

Robin 寫:DSLR需要更換原裝阻隔濾鏡嗎?


I think this is one of the keys, that filter cuts H-alpha exactly just like as it did on DSO imaging. So, it's a hindrance indeed.
oldfield
 
文章: 26
註冊時間: 2010-05-10, 11:46

Re: 用單鏡反光機拍攝H-alpha太陽

文章David » 2012-02-04, 10:45

oldfield 寫:I think this is one of the keys, that filter cuts H-alpha exactly just like as it did on DSO imaging. So, it's a hindrance indeed.


Thanks for the tips. May be I'll try to shoot with my mod 350D sometime. But without the live view, it is going to be more difficult!

Anyway, webcam seems to work best for the sun rather than the DSLR.
APM 80/480, SW 120mm Equinox, C8, Obsession 18"UC with Argo Navis & StellarCat
Lunt LS60T/CaK, LS152T with DSII
DMK31AF03, DMK21AF04, DBK21AF04
Mark V Binoviewer, Ethos (3.7mm, 6mm, 13mm), 19mm Panoptic, 5mm TMB mono
http://www.imsc.edu.hk/pages/astronomy
頭像
David
全域版主
 
文章: 1270
註冊時間: 2010-02-01, 19:33

Re: 用單鏡反光機拍攝H-alpha太陽

文章wyk » 2012-02-04, 10:50

CANON 50D冷卻天文機
像機設定為黑白
DPP處裡輸出
REGISTEX疊圖處裡
PS處裡與合成
附加檔案
20110712BWS.jpg
20110712BWS.jpg (1.98 MiB) 被瀏覽 29401 次
20110712BWS.jpg
20110712BWS.jpg (1.98 MiB) 被瀏覽 29400 次
最後由 wyk 於 2012-02-07, 01:10 編輯,總共編輯了 2 次。
wyk
 
文章: 30
註冊時間: 2010-07-30, 11:47

Re: 用單鏡反光機拍攝H-alpha太陽

文章David » 2012-02-04, 12:10

wyk 寫:CANON 50D冷卻天文機
像機設定為黑白
DPP處裡輸出
REGISTEX疊圖處裡
PS處裡與合成


謝謝分享,細節很豐富。 :P

能否分享多點資料?例如疊合了多少圖?用了Lunt的那支望遠鏡?曝光時間和ISO是多少?
APM 80/480, SW 120mm Equinox, C8, Obsession 18"UC with Argo Navis & StellarCat
Lunt LS60T/CaK, LS152T with DSII
DMK31AF03, DMK21AF04, DBK21AF04
Mark V Binoviewer, Ethos (3.7mm, 6mm, 13mm), 19mm Panoptic, 5mm TMB mono
http://www.imsc.edu.hk/pages/astronomy
頭像
David
全域版主
 
文章: 1270
註冊時間: 2010-02-01, 19:33

Re: 用單鏡反光機拍攝H-alpha太陽

文章社長 » 2012-02-04, 18:48

wyk 寫:CANON 50D冷卻天文機
像機設定為黑白
DPP處裡輸出
REGISTEX疊圖處裡
PS處裡與合成


wyk兄抱歉,我不小心弄掉了你的照片,請重新上載,但不要"插入文章",那樣看帖時只要點擊一下照片便可看到全圖。
兩個天文台 - 白鷺湖天文台、西藏自動化天文觀測站
主鏡 - Officina Stellare 500 口徑f3.8 RiFast攝星儀、APM/TMB 254 f9 APO、SkyWatcher Dob 18、305 f8.5 牛頓鏡、Paramount ME 赤道儀
配件 - 2 full sets of Supermonocentrics、Baader Mark V Binoviewer、Ethos、Canon 5D Mark II Mod、FLI Proline 16803冷凍相機、Mercedes SUV
星河科研社 http://www.astro.hk 電郵 saviofong@astro.hk
頭像
社長
Site Admin
 
文章: 12686
註冊時間: 2010-02-01, 14:17
來自: 香港

Re: 用單鏡反光機拍攝H-alpha太陽

文章mwtse » 2012-02-04, 19:15

David 寫:一般來說,太陽邊緣日珥和太陽圓盤需要不同曝光時間。不過你也可以用只一張日珥曝光正常的相,然後用它的綠色通道作為太陽圓盤(可參考Sky & Telescope July 2004)。附圖為原相和處理後的圖,沒有疊相。

為甚麼原相會有一個明顯的圓圈在太陽邊緣?
mwtse
 
文章: 483
註冊時間: 2011-05-01, 20:09

Re: 用單鏡反光機拍攝H-alpha太陽

文章David » 2012-02-05, 21:32

mwtse 寫:為甚麼原相會有一個明顯的圓圈在太陽邊緣?


There are a few strange things in such photo.

1. Theoretically, only H-alpha light enters the camera. Then how come there are green and blue signals in the picture?
2. The central part of the sun is dimmer, rather than brighter than the rest of the solar disk.
APM 80/480, SW 120mm Equinox, C8, Obsession 18"UC with Argo Navis & StellarCat
Lunt LS60T/CaK, LS152T with DSII
DMK31AF03, DMK21AF04, DBK21AF04
Mark V Binoviewer, Ethos (3.7mm, 6mm, 13mm), 19mm Panoptic, 5mm TMB mono
http://www.imsc.edu.hk/pages/astronomy
頭像
David
全域版主
 
文章: 1270
註冊時間: 2010-02-01, 19:33

Re: 用單鏡反光機拍攝H-alpha太陽

文章mwtse » 2012-02-05, 22:18

David 寫:1. Theoretically, only H-alpha light enters the camera. Then how come there are green and blue signals in the picture?

May be the filter before the green pixel is not perfect, it allows a small amount of IR to pass though, so the CCD will get some exposure.

David 寫:2. The central part of the sun is dimmer, rather than brighter than the rest of the solar disk.

Not quite understand what you mean??
I just find that, the solar disc is not even in brightness, but the unevenness is not centered at the centre of the sun. Is the sun framed at the centre of the field of view?
mwtse
 
文章: 483
註冊時間: 2011-05-01, 20:09

Re: 用單鏡反光機拍攝H-alpha太陽

文章oldfield » 2012-02-06, 10:37

1. The outer part is brighter since it's overexposed in red (see 2, if you have signal leakage in green/blue, that means you're overexposing red since it should be purely red if properly exposed)

2. The central part is dimmer since it's a result of signal leakage into green/blue channels
oldfield
 
文章: 26
註冊時間: 2010-05-10, 11:46


回到 儀器 - 太陽觀測儀器

誰在線上

正在瀏覽這個版面的使用者:沒有註冊會員 和 1 位訪客

cron