Saturn Tonite (10 July 2013, ASI Vs DBK)

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Chanlunlun
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註冊時間: 週四 09 10月, 2003 21:06

Saturn Tonite (10 July 2013, ASI Vs DBK)

文章 Chanlunlun » 週四 11 7月, 2013 10:31

Telescope :- Celestron C-11 (at f/18 for ASI130MC, f/25 for DBK21AU618)
Mount :- CPC1100 , reconstructed for full robotic operation.

Camera set 1
Barlow lens :- MIZAR ETL-2, 1.8X. ( modified )
Camera :- ZWO ASI130MC + Astronomik IR Block filter

Camera set 2
Barlow lens :- TeleVue 2.5X powermate
Camera :- DBK21AU618

Capturing software :- SharpCap.
Resolution :- 640 x 480
Stacking software :- Registax 5.0 ( I found Registax 6 is being difficult to use )
Exposure :- 1/30 sec for 3000 frames for both cameras.
Gain :- 90 for ASI130MC, 996 for DBK21AU618
Gamma :- 50
White Balance :- Camera auto.
Site :- Causeway Bay.
Sky stability :- 7/10
Sky transparency :- 8/10

Two camera shot Saturn at nearly the same time under the same night to make comparisons. Time was consumed to change cameras and barlows but I tried to shorten the time lag as much as possible. It seemed that while shooting with the ASI camera the stability was a little bit better.

Results showed that the ASI camera , under very careful post processing, is able to reduce its noises significantly. The result is quite comparable to DBK21AU618.

Another advantage of the ASI camera is that it has rather small pixel size, with means that the image could have more pixels (hence more information) even at lower f/ratio. This reflects in the image size – at f/18 the ASI produces an image even bigger than the DBK working at f/25, both cameras have same resolution of 640 X 480. You can see in the attached images.

However it is the DBK that obviously has higher quality image, under the same sky condition, after all.
附加檔案
video 13-07-10 20-16-22S.jpg
Saturn captured by DBK21AU618 camera at same night at 8:16 p.m. The image is very smooth making post-processing easy. Even at f/25, the image is still obviously smaller than that by ASI at f/18.
video 13-07-10 20-16-22S.jpg (101.89 KiB) 已瀏覽 8179 次
Capture 7_10_2013 19_30_40LL.jpg
Image from ASI120MC at f/18 at 7:30 p.m. Though at lower f/ratio, its image is still bigger than that captrured by DBK camera. Careful post-rocessing is applied to reduce moises as much as possible. Result is not that bad.
Capture 7_10_2013 19_30_40LL.jpg (11.05 KiB) 已瀏覽 8179 次

anyone
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文章 anyone » 週四 11 7月, 2013 11:03

罕見鏡神的行星作品,原來一樣咁掂 。 [Good Job]

Chanlunlun
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文章 Chanlunlun » 週四 11 7月, 2013 15:17

anyone 寫:罕見鏡神的行星作品,原來一樣咁掂 。 [Good Job]
Thanks Mr. One.

I am no expert in shooting planets but just a beginner at early part of the learning curve.

BossKwan
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註冊時間: 週五 01 10月, 2004 03:07

Re: Saturn Tonite (10 July 2013, ASI Vs DBK)

文章 BossKwan » 週四 11 7月, 2013 15:55

[Good Job]

Very nice Saturn!!
Both images are wonderful!

Also, Congratulations! your CPC finally starts a good production.
Good comparison of two cameras, and very informative particularly for me... :)
Chanlunlun 寫: Results showed that the ASI camera , under very careful post processing, is able to reduce its noises significantly. The result is quite comparable to DBK21AU618.

Another advantage of the ASI camera is that it has rather small pixel size, with means that the image could have more pixels (hence more information) even at lower f/ratio. This reflects in the image size – at f/18 the ASI produces an image even bigger than the DBK working at f/25, both cameras have same resolution of 640 X 480. You can see in the attached images.

However it is the DBK that obviously has higher quality image, under the same sky condition, after all.

BossKwan
中子星
文章: 1175
註冊時間: 週五 01 10月, 2004 03:07

文章 BossKwan » 週四 11 7月, 2013 16:16

anyone 寫:罕見鏡神的行星作品,原來一樣咁掂 。 [Good Job]
:lol: 好多人以為鏡神唔影星,呢的就係 "深藏不露"
The reason is very simple: by his years of experience, he knows every skill about handling any gears although he doesn't fancy astro-photography. He is a real visual astronomy supporter. :)

benben88
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文章: 822
註冊時間: 週四 02 6月, 2005 22:56

文章 benben88 » 週四 11 7月, 2013 21:01

[Good Job] [Good Job] [Good Job]

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Eddy So
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註冊時間: 週四 04 12月, 2008 22:35
來自: 中男海

文章 Eddy So » 週四 11 7月, 2013 22:02

[Good Job] 好圖! [Good Job]

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昇仔
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文章 昇仔 » 週六 13 7月, 2013 00:26

好得好得!

[Good Job] [Good Job] [Good Job]

mkwong
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註冊時間: 週六 06 7月, 2013 08:26

文章 mkwong » 週六 13 7月, 2013 00:58

請問有甚麼網站有介紹怎樣運用ASI130MC影行星,和後期處理

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