我的12.5"反射鏡
我的12.5"反射鏡
前後花了年多的時間,終於在勞動節總裝完成!
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最後由 蔡sir 於 週一 08 5月, 2006 01:10 編輯,總共編輯了 2 次。
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- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
Dear Mr. Panda,Tarepanda 寫:那看來鏡子保存的很好,反射面很漂亮,2寸也真夠厚的,不知道XR250那塊是否也是2寸,不知道何時才能用它一睹行星,相信一定很漂亮,因為農莊Subaru的那支8寸反射已經沒得頂了
The telescope just looks so professional and our telesopes are just dwarfted by such beautifully crafted equipment.
I owned a 12.5 inch 2 inch thick pyrex mirror once and the mirror came from Edmund. I uased it to viewed deep sky objects and planets. My feeling is that with for such a huge thickness it is quite impossible for the mirror to attain thermal equilibrium within a resonable time. There was always turbulance obseving high power inside the eyepiece.
The mirror is very heavy, at 10 kg and with accessories fitted the whole telescope can easily reach a total weight of nearly 50 lbs, heavier than our 30 inch mirror blank.
If the telescope is not intended for outdoor usage (like ours !! ) then this impressively crafted telescope will be a great equipment for astronomy.
Best regards
Chan Yuk Lun
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- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
Dear Mr. Tong,TONGKW 寫:我考慮遲些自裝一台 10吋或12吋口徑的牛頓鏡,有個問題想請教各位,這套主鏡用上了 6 個夾子來固定,會不會產生更多來自主鏡夾子的繞射 (mirror clip diffraction),加上繞射來自副鏡支架 (spider vane diffraction),在高倍目視觀測時有沒有影響。
不幸大口徑的主鏡通常都很重,不知道再有沒有其他辦法來固定主鏡及防止在搬動時移位。
Why use clips? I advice using double sided gluing tapes to fix the mirror onto a flat baseplate. You will solve all problems all at once.
Best regards
Chan Yuk Lun
I have a question about the main mirror cell.
When doing collimation, there may be a need to adjust the mirror slightly along the x-axis and y-axis, so that the centres of the main mirror and secondary mirror will be matched.
What is the mechanism of achieving these adjustments in a dob? (I am making a dob and this is one of my problems encountered.)
It will be best if some pictures/charts illustrating the structure of the main mirror cell can be provided.
Thanks a lot.
When doing collimation, there may be a need to adjust the mirror slightly along the x-axis and y-axis, so that the centres of the main mirror and secondary mirror will be matched.
What is the mechanism of achieving these adjustments in a dob? (I am making a dob and this is one of my problems encountered.)
It will be best if some pictures/charts illustrating the structure of the main mirror cell can be provided.
Thanks a lot.
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- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
Dear Mr. Kmng,akltsang 寫:I have a question about the main mirror cell.
When doing collimation, there may be a need to adjust the mirror slightly along the x-axis and y-axis, so that the centres of the main mirror and secondary mirror will be matched.
What is the mechanism of achieving these adjustments in a dob? (I am making a dob and this is one of my problems encountered.)
It will be best if some pictures/charts illustrating the structure of the main mirror cell can be provided.
Thanks a lot.
There is no centers for a flat secondary diagonal mirror. All you need to do is to adjust the tilt of the primary so that its optical axis just passes through the center of eyepiece.
The best possible mechanism for you to reference to is the BOSMA 3 inch reflector ( or any other brand ). Buy one ( at HKD 200 or so ) at Ap Liu street and dismantle it and you will find what you need to do.
Best regards
Chan Yuk Lun
我也有同樣問題,我打算用多塊強力雙面膠,磨鏡班用的那種,用它來固定主鏡,不想用夾住的方法固定主鏡,畢竟8寸的玻璃不算重,Chanlunlun 寫:Dear Mr. Tong,TONGKW 寫:我考慮遲些自裝一台 10吋或12吋口徑的牛頓鏡,有個問題想請教各位,這套主鏡用上了 6 個夾子來固定,會不會產生更多來自主鏡夾子的繞射 (mirror clip diffraction),加上繞射來自副鏡支架 (spider vane diffraction),在高倍目視觀測時有沒有影響。
不幸大口徑的主鏡通常都很重,不知道再有沒有其他辦法來固定主鏡及防止在搬動時移位。
Why use clips? I advice using double sided gluing tapes to fix the mirror onto a flat baseplate. You will solve all problems all at once.
Best regards
Chan Yuk Lun
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