But for $20,000 a 26" Dobsonian ??? Who on Earth can beat that price performance ratio ???Chanlunlun 寫:Thanks for WongSir's comment.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.
.
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.
鏡神 2015' diy QC 26" Nasmyth Dobsonian telescope 杜蘇望遠鏡
-
- 中子星
- 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
-
- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
Sorry this telescope is designed not for travelling.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 ?
The total weight of the telescope exceeds 100 kg and it only stays at roof of QC.
-
- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
I would very much like to. But the sheer weight and size of the equipment forbids me.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 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.
-
- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
-
- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
-
- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
-
- 中子星
- 文章: 1692
- 註冊時間: 週日 11 9月, 2005 01:34
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.Chanlunlun 寫:Good question.bingsze 寫:咁你點樣搬上天台的?
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.
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.
誰在線上
正在瀏覽這個版面的使用者:沒有註冊會員 和 11 位訪客