好像是星冕儀

[peter]

Planetary Imaging Concept Testbed Using a Recoverable Experiment–Coronagraph

http://astronomicaltelescopes.spiedigitallibrary.org/article.aspx?articleid=2442760


http://familystar.org.tw/index.php?option=com_smf&Itemid=45&topic=18350.0

[peter]

https://www.researchgate.net/figure/45881000_fig1_Fig-4-Upper-The-pupil-shape-of-a-telescope-with-central-obstruction-and-spider






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http://lyot.org/background/coronagraphy.html



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http://familystar.org.tw/index.php?option=com_smf&Itemid=45&topic=28336.0

遮木星光茫是否是類似這方式 ?

[peter]

DIY  
self made coronograph
https://www.cloudynights.com/topic/405768-self-made-coronograph/



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http://familystar.org.tw/index.php?option=com_smf&Itemid=45&topic=18350.0

[peter]

KECK 好像這

https://www.pinterest.com/pin/567383253040374382/

The vortex mask shown at left is made out of synthetic diamond, 1 centimeter in diameter an0.3 millimeters thick. The image at right zooms into the mask's center, highlighting its concentric grooves, which have a thickness about a hundred times smaller than a human hair. This vortex coronagraph was recently installed inside NIRC2 (Near Infrared Camera 2), the infrared imaging camera at Keck. It can image planetary systems and brown dwarfs closer to their host stars than any other instrument.

[星空旅者]

業餘的應該是日冕儀比較多，雖然原理都一樣，
不過受限大氣散射的關係，看日冕效果還是沒有天然的好，除非是搬到太空去

大多都是拿來拍日珥，古早前高橋有出過，用起來有點麻煩還是拿日珥鏡簡單，
國內嘛恐怕也只有北門王牧師有了~~~

[peter]

lovejoy 拍木星時說使用 mask  遮木星光
 是如何遮的 ??

[星空旅者]

lovejoy 拍木星時說使用 mask  遮木星光
 是如何遮的 ??

就是想辦法在焦點位置放一個小圓盤，位置要放對，
這樣就可以在視野裡造成一小塊黑影來遮光了

位置不對那結果就跟反射鏡的次鏡一樣