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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: 364

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: 364

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: 364

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: 334

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: 136

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: 125

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: 243

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: 103

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: 137

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: 170

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: 170

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: 163

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: 289

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
Chanlunlun
週日 20 5月, 2018 21:57
版面: 天文攝影 Astrophotography
主題: Jupiter from window (19 May 2018)
回覆: 3
觀看: 159

Jupiter from window (19 May 2018)

Good weather prevails and chances of shooting Jupiter are not to be missed. The stability was very good though clouds were coming in and out.

Telescope : Celestron C11
Camera : ASI174MM, LRGB
stacking ; AS!2
Image processing ; Registax 6 wavelets
Chanlunlun
週六 19 5月, 2018 17:39
版面: 天文活動消息 Astro Activity News
主題: 20 inch telescope will proceed PTC tonite(19 May)
回覆: 0
觀看: 90

20 inch telescope will proceed PTC tonite(19 May)

20吋鏡如期出動,今晚目標?當然是星系巢啦,不過不是室女座,而是大熊座的,廿吋鏡將於9時30分離場,原因? 因為要趕回家中覌察和拍攝木星,現在是木星衝期,唔好嘥。

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