小弟又攪攪震去wongsir 班度磨鏡~
但今次個問題我真係攪唔掂.....
希望各位大師出手指點迷津~
事源係鏡神早排出左個homemade astrograph post....
指引左我都有整astrograph既念頭~
但經過計算....我要用雙曲面先可以改正到佢既SA,
本身以為雙曲面唔難....但原來我錯了....
一直所學都是以追求拋物面為王道....
要如何做雙曲面我一籌莫展~
根據xp figure 月口我宜家鏡面k=-0.71, 但雙曲面須要將邊緣磨低....
是否正常？ 有何辦法可以用？ 中央密集既W拋物化手法？?
感謝呢！！
自製165mm 雙曲面攝星鏡 (22/1 更新m42實測圖)
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Chanlunlun
- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
No.浩 寫:以上面的圖來說, 我要磨走的是紅色的地方??
就是一座山加一個高邊?
The figure you see in the analysis is what is called the apparent cross section, not the real figure of your mirror , nor the shape of glass that you need to remove.
Just deepen the center as much as you could, use very long strike together with very soft pitch.
Dear Mirror god,Chanlunlun 寫:No.浩 寫:以上面的圖來說, 我要磨走的是紅色的地方??
就是一座山加一個高邊?
The figure you see in the analysis is what is called the apparent cross section, not the real figure of your mirror , nor the shape of glass that you need to remove.
Just deepen the center as much as you could, use very long strike together with very soft pitch.
thank for you comment!
but when i play with the simulation, it seems to be the glass i need to remove??
and it make sense to remove the centre and edge glass further for me....
i should use the normal parabolizing W stroke for this task?
Thanks!!!!!~
攪攪震繼續,
在大家相助下小弟成功完成左主鏡既雙曲化
並已經鍍好鋁!
但小弟不才,
未有時間做好OTA,
主鏡座仍在加工中,
但忍唔住用PVC加膠板木板做簡單的OTA
測試左支鏡既效果先~~
希望大家唔好取笑......
目標係400米外的濾水廠大樓
在大家相助下小弟成功完成左主鏡既雙曲化
並已經鍍好鋁!
但小弟不才,
未有時間做好OTA,
主鏡座仍在加工中,
但忍唔住用PVC加膠板木板做簡單的OTA
測試左支鏡既效果先~~
希望大家唔好取笑......
目標係400米外的濾水廠大樓
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