The making of 26 inch Cassegrain - 24, Telescope Finished.

自製天文望遠鏡 牛頓望遠鏡 杜蘇式 卡式 設計和磨鏡方法<br>
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Chanlunlun
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文章: 3788
註冊時間: 週四 09 10月, 2003 21:06

The making of 26 inch Cassegrain - 24, Telescope Finished.

文章 Chanlunlun » 週五 29 1月, 2016 09:52

Dear ATMers,

After more than 2 years of struggling, the 26 inch telescope is officially declared completed today, on the day of annual Open Day of our school.

The whole telescope will be displayed on the roof of Queen’s College on Saturday (30 Jan 2016) and you are cordially invited to come and have a glance and offer comments on this biggest working telescope in HK. According to weather forecast the weather will be fine on Saturday.

At its Cassegrain focus the telescope offers a focal length of 260 inches at f/10. The telescope is very long, has a length of about 11 feet, which makes it an impossibility for a portable instrument. It will stay forever on roof of QC to promote astronomy among students, and any persons who are interested.

The total weight of the instrument is over 100 kg, the giant weight is a must for its stability at our roof, since our school is in constant vibration originating from the next door MTR tunnels.

Below gives a brief final technical specification of this newly finished telescope:-

Aperture :- 26 inches
Type :- Naysmith Cassegrain
Zenith eyepiece height :- about 5 feet, a junior form student’s height.
Secondary mirror diameter :- 10 inches.
Secondary blockage :- 38%, a little bit high. ( C8 is 33%)
Mounting :- alt-azm mount with ServoCAT GOTO and tracking + Argo Navis navigator.
Total weight :- > 100 kg.
Why we make it? :- to experiment if we can see DSO at center of city.

Our student are of course very pleased with what they have accomplished. Please come and share the enjoyment with us.

Best regards
Chan Yuk Lun
29 January 2016
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72a.jpg
The 26 inch Cassegrain, with GOTO and DSC navigation system. It is no more a Dobsonian but rather an alt-azm automated telescope.
72a.jpg (538.25 KiB) 已瀏覽 20758 次
72.jpg
The electronics are all mounted on the eyepiece side of the telescope to facilitate better maneuvering.
72.jpg (360.09 KiB) 已瀏覽 20757 次
最後由 Chanlunlun 於 週五 29 1月, 2016 16:05 編輯,總共編輯了 2 次。

astrostars
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註冊時間: 週四 08 11月, 2007 14:39

文章 astrostars » 週五 29 1月, 2016 12:04

Can I come to your school to gaze the stars at night tomorrow ?

LT
中子星
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註冊時間: 週日 17 8月, 2003 23:20
來自: YL
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文章 LT » 週五 29 1月, 2016 12:09

Congratulations and a new record in HK. Is it silver coated on the mirrors?

Chanlunlun
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文章: 3788
註冊時間: 週四 09 10月, 2003 21:06

文章 Chanlunlun » 週五 29 1月, 2016 12:13

astrostars 寫:Can I come to your school to gaze the stars at night tomorrow ?
You are welcomed at anytime tomorrow before 1730 hrs during which the roof will close.

Regret that we cannot offer star gazing tomorrow.

Chanlunlun
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文章: 3788
註冊時間: 週四 09 10月, 2003 21:06

文章 Chanlunlun » 週五 29 1月, 2016 12:15

LT 寫:Congratulations and a new record in HK. Is it silver coated on the mirrors?
Yes, silver coating on primary and aluminium + SiO on secondary. Meanwhile the secondary is still silver coated and the primary is waiting for warm weather for silvering.

anyone
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文章: 13853
註冊時間: 週六 07 2月, 2009 12:13
來自: hong kong

文章 anyone » 週五 29 1月, 2016 12:23

Congratulation [蔥寶恭喜樣]

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wtyu21
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文章: 5910
註冊時間: 週三 30 5月, 2007 04:18
來自: HKCHN

文章 wtyu21 » 週五 29 1月, 2016 12:28

Mirror God is it GOTOnization? :D :D :D

Chanlunlun
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文章: 3788
註冊時間: 週四 09 10月, 2003 21:06

文章 Chanlunlun » 週五 29 1月, 2016 13:42

wtyu21 寫:Mirror God is it GOTOnization? :D :D :D
Yes , GOTOnization, a world trend.

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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 » 週五 29 1月, 2016 22:08

[蔥寶恭喜樣] 恭喜!恭喜! [蔥寶恭喜樣]

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