鏡神 2015' diy QC 26" Nasmyth Dobsonian telescope 杜蘇望遠鏡

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大黃傻貓GARFIELD
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文章: 1692
註冊時間: 週日 11 9月, 2005 01:34

Re: 鏡神 2015年 diy QC 26吋 杜蘇望鏡

文章 大黃傻貓GARFIELD » 週日 19 4月, 2015 12:17

Chanlunlun 寫:
Wongsir 寫: 嘩! 親自看過才知這樣壯觀, 又大又高. 基本上是木制, 结構簡單而扎實, 鏡神透露26吋大鏡計劃祇用了二千多元, my God, 真是Chanlunlun的一貫作風, 以最便宜和方便的物料, 造出性價比最高的望遠鏡.

.
Thanks for WongSir's comment.

Actually the secondary mirror is a hyperboloid instead of sphere. The cost of the telesdope is increasing because the ServoCAT and Argo Navis will cost HK$18000.

The coating of the secondary mirror and primary mirror will add further 2000 to 3000 dollars

So the total cost will add up to around HK$20,000.
But for $20,000 a 26" Dobsonian ??? Who on Earth can beat that price performance ratio ???

Chanlunlun
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文章: 3847
註冊時間: 週四 09 10月, 2003 21:06

文章 Chanlunlun » 週一 20 4月, 2015 18:14

大黃傻貓GARFIELD 寫:For such an aperture, it has to be Cassegrain to have the shortest tube length possible.
You have to use Dobsonian mount to keep the support at a very low cost (plus giving it the transportability).

Can it be taken apart and move to a darker location ? I think Chan Sir will have got that in his mind when designing it.

Did Chan sir "borrow" any ideas from others ?

:D
Sorry this telescope is designed not for travelling.

The total weight of the telescope exceeds 100 kg and it only stays at roof of QC.

LT
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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 » 週一 20 4月, 2015 21:25

只放在QC用,有點浪費26"口徑。最少一次,帶往PTC與眾同樂!

Chanlunlun
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文章 Chanlunlun » 週二 21 4月, 2015 09:37

LT 寫:只放在QC用,有點浪費26"口徑。最少一次,帶往PTC與眾同樂!
I would very much like to. But the sheer weight and size of the equipment forbids me.

I am wondering bringing a 24 inch Newtonian to PTC. The 24 incher is designed to be portable, but not for this 26 incher. However the 24 incher lacks GOTO and there is no encoders built in.

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扒飯撈麵
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文章: 2960
註冊時間: 週日 06 7月, 2003 00:12
來自: 太空

文章 扒飯撈麵 » 週二 21 4月, 2015 12:05

a van is ok for transportation within HK.

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wtyu21
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文章: 5933
註冊時間: 週三 30 5月, 2007 04:18
來自: HKCHN

文章 wtyu21 » 週二 21 4月, 2015 20:18

鏡神之名並非浪得虛名~ :D :D :D

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bingsze
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文章: 3939
註冊時間: 週一 15 1月, 2007 18:13
來自: hong kong

文章 bingsze » 週五 24 4月, 2015 18:00

我覺得分開來搬有得諗,唔知最重嗰件有幾重?

Chanlunlun
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文章 Chanlunlun » 週五 24 4月, 2015 18:30

bingsze 寫:我覺得分開來搬有得諗,唔知最重嗰件有幾重?
>100 kg !!!!

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bingsze
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註冊時間: 週一 15 1月, 2007 18:13
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文章 bingsze » 週五 24 4月, 2015 19:01

分開咗都咁重,定係成枝呀?

Chanlunlun
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文章 Chanlunlun » 週六 25 4月, 2015 10:08

bingsze 寫:分開咗都咁重,定係成枝呀?
Only the mirror box.

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bingsze
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文章 bingsze » 週六 25 4月, 2015 11:05

咁你點樣搬上天台的?

Chanlunlun
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文章 Chanlunlun » 週六 25 4月, 2015 13:20

bingsze 寫:咁你點樣搬上天台的?
Good question.

It took 5 men taking the parts, and the primary mirror, to the roof. The mirror box was assembled there.

After then the mirror box will never leave the roof again.

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bingsze
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文章 bingsze » 週六 25 4月, 2015 16:17

下次係地下道整,之後直接上Van仔,另外一件天文附件:)

大黃傻貓GARFIELD
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文章: 1692
註冊時間: 週日 11 9月, 2005 01:34

文章 大黃傻貓GARFIELD » 週六 25 4月, 2015 18:01

Chanlunlun 寫:
bingsze 寫:咁你點樣搬上天台的?
Good question.

It took 5 men taking the parts, and the primary mirror, to the roof. The mirror box was assembled there.

After then the mirror box will never leave the roof again.
That I think I can imagine. I heard some HK guys bought a 16 inch Meade dob, and the mirror box is really heavy (the weight is also obeys the square laws and also add the factor of thicker glass.

For a 12" dob (mine) the mirror box is 36 pound, and just apply the square law to a 26 inch and we can get a feel of how massive the thing is.

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