有 3811 筆資料符合您搜尋的條件

Chanlunlun
週二 29 1月, 2019 19:03
版面: 天文活動消息 Astro Activity News
主題: 20 inch telescope will proceed PTC tonite(29 Jan 2019)
回覆: 0
觀看: 224

20 inch telescope will proceed PTC tonite(29 Jan 2019)

As title. Tonight the transparency is much better than yesterday and hopefully, those galaxies could not be seen yesternight can be seen tonight.
Chanlunlun
週六 26 1月, 2019 17:23
版面: 天文活動消息 Astro Activity News
主題: 20 inch telescope will proceed ptc tonite (26 Jan)
回覆: 0
觀看: 136

20 inch telescope will proceed ptc tonite (26 Jan)

雖然今天透明度奇差,不過都去博一博。
Chanlunlun
週四 03 1月, 2019 22:36
版面: 談天說地 Chatting Square
主題: Happy New Year 2019
回覆: 7
觀看: 704

Re: Happy New Year 2019

Long Time no see, Boss Kwan.

Happy new year to you and to all.
Chanlunlun
週一 29 10月, 2018 17:20
版面: 天文活動消息 Astro Activity News
主題: 20 inc telescope will proceed PTC tonite (29 Oct 2018)
回覆: 1
觀看: 242

20 inc telescope will proceed PTC tonite (29 Oct 2018)

As tile. Tonite's theme: very very dim planetary and some very faint open clusters and galaxy. The telescope will leave at around 9:00 p.m.
Chanlunlun
週日 28 10月, 2018 17:19
版面: 天文活動消息 Astro Activity News
主題: 20 inch telescope will proceed PTC tonite(28 Oct 2018)
回覆: 0
觀看: 338

20 inch telescope will proceed PTC tonite(28 Oct 2018)

Tonight's theme: Open Cluster in Autumn sky.
Note that due to the mon rise the telescope will leave at around 9 pm.
Chanlunlun
週五 05 10月, 2018 17:52
版面: 天文活動消息 Astro Activity News
主題: 20 inch telescope will proceed PTC tonite (5 Oct 2018)
回覆: 0
觀看: 359

20 inch telescope will proceed PTC tonite (5 Oct 2018)

As title.

Tonight's main theme:- beautiful open clusters in the northern sky and some very small, very dim and very rarely observed galaxies.

The telescope will be dismantled at around 2300.
Chanlunlun
週日 30 9月, 2018 17:22
版面: 天文活動消息 Astro Activity News
主題: 20 inch telescope will proceed PTC tonite (30 Sep 2018)
回覆: 0
觀看: 359

20 inch telescope will proceed PTC tonite (30 Sep 2018)

As title.
Tonight's theme: dim, small and rarely seen galaxies.
Chanlunlun
週六 29 9月, 2018 17:35
版面: 天文活動消息 Astro Activity News
主題: 20 inch telescope will proceed PTC tonite(29 Sep)
回覆: 0
觀看: 371

20 inch telescope will proceed PTC tonite(29 Sep)

As title. Tonight's main theme : open clusters.
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: 1021

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: 1021

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: 1357

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: 1357

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: 1357

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: 777

Re: 心之色彩

調色盤中,以此為最。

前往進階搜尋