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Chanlunlun
週四 26 7月, 2018 20:49
版面: 天文話題 Everything about Astronomy
主題: 雲南双子天文庄園
回覆: 11
觀看: 371

Re: 雲南双子天文庄園

Balancing weights, plenty. Tripod ? I’m not quite sure.
Chanlunlun
週四 26 7月, 2018 18:27
版面: 天文話題 Everything about Astronomy
主題: 雲南双子天文庄園
回覆: 11
觀看: 371

Re: 雲南双子天文庄園

I had paid a visit in the Gemini this February. A great place for deep sky imaging but just mediocre for visual observation. The site has been more or less contaminated by light pollution by surrounding villages. After midnight the situation improved a lot since most people got slept and lights were...
Chanlunlun
週五 22 6月, 2018 06:53
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 8吋鏡 - 拋光/球面化時遇到的問題
回覆: 9
觀看: 770

Re: 8吋鏡 - 拋光/球面化時遇到的問題

The mirror is not smooth. Cold press can do very little towards matching the surface of mirror to pitch surface. You should hot press the pitch lap every time you start polishing again. Best of all is that the polishing should be done all in once, avoiding pressing the pitch lap from time to time. P...
Chanlunlun
週六 09 6月, 2018 07:37
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 8吋鏡 - 拋光/球面化時遇到的問題
回覆: 9
觀看: 770

Re: 8吋鏡 - 拋光/球面化時遇到的問題

Back to #1200, mirror on top using 1/3 center to center stroke.
Chanlunlun
週二 05 6月, 2018 06:40
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 8吋鏡 - 拋光/球面化時遇到的問題
回覆: 9
觀看: 770

Re: 8吋鏡 - 拋光/球面化時遇到的問題

You have a huge amount of turned down edge, difficult to cure by pitch lap.

Best suggestion : go to #1200 fine grinding and do polishing again with hard pitch. What is the f/no. of your mirror ?
Chanlunlun
週六 02 6月, 2018 07:28
版面: 天文攝影 Astrophotography
主題: 心之色彩
回覆: 10
觀看: 502

Re: 心之色彩

調色盤中,以此為最。
Chanlunlun
週五 01 6月, 2018 14:42
版面: 天文攝影 Astrophotography
主題: Jupiter by Window(31 may 2018)
回覆: 2
觀看: 241

Jupiter by Window(31 may 2018)

At the night of last day of May the stability was exceptionally good. I grasped the opportunity to shoot Jupiter when she just passed before my window. Telescope ; Celestron C11 Mount ; cpc1100 alt-azm mode. Camera ; ASI174MM Method : RGB Stacking software : AS!2 Post image processing : Registax 6 J...
Chanlunlun
週四 31 5月, 2018 13:18
版面: 天文攝影 Astrophotography
主題: Jupiter by window(30 May 2018)
回覆: 3
觀看: 228

Jupiter by window(30 May 2018)

Clouds!

This shot was made behind clouds so that resolution suffered a bit.

Telescope : Celestron C11
Mount : coc1100 alt-azm mode.
Camera : ASI174MM
Shooting method :LRGB
Chanlunlun
週三 30 5月, 2018 15:55
版面: 天文攝影 Astrophotography
主題: 二零一八,南天打咭
回覆: 8
觀看: 376

Re: 二零一八,南天打咭

Oh my god!
Chanlunlun
週三 30 5月, 2018 14:48
版面: 天文攝影 Astrophotography
主題: Jupiter from window(29 May 2018)
回覆: 0
觀看: 240

Jupiter from window(29 May 2018)

Yesternight was another night with clear weather. Although the stability was mediocre but from time to time steady seeing did exist. This shot was taken during such time slot. Telescope : Celestron C11 Mount : coc1100 alt-azm mode. Camera : ASI174MM Shooting method : RGB Notice that this is only a R...
Chanlunlun
週二 29 5月, 2018 06:59
版面: 天文攝影 Astrophotography
主題: Jupiter from window(27 May 2018)
回覆: 4
觀看: 238

Jupiter from window(27 May 2018)

The seeing in 27 May was not superb but still acceptable, at least enough to resolve Io when she travel across the face of Jupiter.

Telescope : Celestron C11 at f/25
Mount : cpc1100 in alt-azm mode.
camera ; ASI174MM + RGB

This picture was captured in RGB mode. There was no L channel.
Chanlunlun
週日 27 5月, 2018 17:58
版面: 天文攝影 Astrophotography
主題: Jupiter from window(23 May 2018)
回覆: 4
觀看: 257

Re: Jupiter from window(23 May 2018)

Thanks. Only by luck I got steady seeing at home.
Chanlunlun
週日 27 5月, 2018 09:14
版面: 天文攝影 Astrophotography
主題: Jupiter from window(23 May 2018)
回覆: 4
觀看: 257

Jupiter from window(23 May 2018)

Tonight excellent seeing again appears, it is a good chance to capture Jupiter together with its nearly turn away great red spot. Looking at the picture you will see the great red spot lying just at the left edge of Jupiter, nearly disappearing into the giant planet's back. Telescope : Celestron C11...
Chanlunlun
週二 22 5月, 2018 21:20
版面: 天文攝影 Astrophotography
主題: Jupiter from window (21 May 2018)
回覆: 2
觀看: 224

Jupiter from window (21 May 2018)

We are stilling having continuous fine weather and Jupiter is shining on the sky every night. It is a pity that we don't nail it down and so I did it. This shot is from the night of 21 of May, when the sky was still having very good stability and good transparency. Telescope : Celestron C11 Camera :...
Chanlunlun
週一 21 5月, 2018 11:23
版面: 天文攝影 Astrophotography
主題: 窗口前的木星(20 May 2018)
回覆: 5
觀看: 396

窗口前的木星(20 May 2018)

昨天晚上除了沒有云外 , 穩定度世很好 , 咁梗係映木星喇 , E+係木星大衝期 , 真係唔好浪費上天所賜良機 , 木星猶如一個獨眼巨人咁望住你。

珀攝日期時期 : 20 May 2018 晚上11時19分
拍攝地點 : 九龍西
Telescope : Celestron C11
Barlow : teleVue Powermate 2.5X
Camera : ASI174MM
Shooting : RGB
Stacking software ; AS!2
Image processing : RGB Registax 6, wavelet Registax 6

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