順便再問一下
為什麼需要那麼大的光圈?
曝光時間短? 底片的感光度很低?
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http://sales.hamamatsu.com/assets/pdf/parts_C/e_directx.pdf
X-ray Imaging Systems
http://imagine.gsfc.nasa.gov/docs/science/how_l2/xtelescopes_systems.html
Kowa 65mm f/0.75 X-Ray Lens Mounted on a Nikon D90
http://www.petapixel.com/2010/11/27/kowa-65mm-f0-75-x-ray-lens-mounted-on-a-nikon-d90/
http://www.flickr.com/photos/astrophysics/4519990392/
上述組合拍攝出來的影像
最後這裡有一段關於 X 光機大光圈鏡頭的解釋.
http://www.optec.eu/eng/xray/xray_lenses.htm
How described in the previous paragraphs, the optical path in X-RAY imaging runs from the light emitting phosphor of the image intensifier tube to the recording surface of a camera. In both cases the optical systems will be optimised for the glass layer mounted on a tube intensifier and on the TV-Camera. Normally the thickness of the cover glass of the Vidicon camera is 2.3 mm and 1 mm for a CCD Camera.
X光影像的光路是由磷光屏到光電影像增強管再進入照相機的影像紀錄面(either CCD or film). 在上述兩狀況中, 光學系統的設計是針對光電影像增強管以及電視攝影機進行最佳化. 通常電視攝影機的 cover glass 為 2.3 mm 厚, CCD 攝影機的 cover glass 為 1.0 mm 厚.
The same optical system is designed to accept this glass thickness variation. The thickness of the cover glass mounted on the intensifier tube is different, in fact it can change from 3.5 mm to 16 mm : for this reason is necessary to design the appropriate optical system with a compensation for each particular cover glass.
由於各型光電倍增管所貼的蓋玻片厚度不一, 所以 X-ray 光學系統必須得適應不同的 cover glass 厚度. 事實上,蓋玻片厚度從 3.5 mm 到 16 mm 都有. 因此 X-ray 光學系統必須設計成具有比較高的寬容度, 以適用於各種厚度的蓋玻片.
In the following paragraphs the optical systems as collimating lens, TV-Camera lens and optical relay will be presented and described; in the table 3.1 the list of the Optical Relay is reported, in the table 3.2 and 3.3 the list of the collimating lens and in the "X-RAY Application Table" all the possibilities to couple the lens with the X-Ray tube and TC-Camera are listed.
Any description will be performed about the cine/spot camera lens because, for the moment, OPTEC doesn't produce these particular optical systems. The standard solution is composed of two lenses, a collimating lens and a camera lens, combined to a so called tandem combination.
The focal plane of the collimating lens coincides optically with the object plane ( this plane is the output window of the intensifier tube ). In this manner the object plane is projected to infinity plane, normally the focal length of the collimating lens is chosen such as to make the maximum field angle 8 degrees.
In front of the collimating lens the TV-Camera lens is mounted in order to transfer the image from the collimator to the focal plane of the TV-Camera lens ( this plane is the recorder surface of the camera ).
山不在高有仙則名
水不在深有龍則靈
機不在貴要拍才行
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