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Lens less pin-hole image

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發表於 2008-7-7 18:06:46 | 顯示全部樓層 |閱讀模式
Playing 350D like a toy



Probably a pin-hole camera can take decent colors of the twilight sky.

AC
發表於 2008-7-7 19:38:43 | 顯示全部樓層
噫, pin hole lens 效果都唔錯喎,多謝分享
 樓主| 發表於 2008-7-7 23:41:28 | 顯示全部樓層
做了一個簡單實驗,心裡也感到一陣喜悅,一個小小針孔竟然可以玩餐飽,不祈然想起兒時情景,雪條棍 + 橡根 做的玩具槍,牛奶空罐做的拖地轉燈 (在中秋夜玩的),不用電池的礦石收音機 ......,貧亦樂。

有機會我會嘗試 Pinhole  f/500 ~ f/1000 影太陽 (Hehe, 破 Canon 以前的 f/494 記錄 !) 。預算用 0.5mm 針孔,焦距 250 ~ 500 mm,配 ToUcam stack 佢一百幾十張,大慨會出一個二三吋大的 ”黃色太陽”,Resolution 當然不會好,但都有 ~4 arcmin 或太陽視直徑的 1/8 (Dawes limit)。

AC
發表於 2008-7-8 21:43:22 | 顯示全部樓層
With the air pollution, I guess it could become hard to break old records?
發表於 2008-7-8 23:32:38 | 顯示全部樓層
hehehe. Diffraction will further kill the resolution. :-)

Eric
 樓主| 發表於 2008-7-9 00:31:34 | 顯示全部樓層
That's why I guess image resolution ~ 1/8 solar diameter; could be a bit worse due to "reciprocal failure" of being too-small in pinhole size. Anyway this is a physics game and not astronomy showpiece. Be fun with it.
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