Borg層層疊其中的好處是可任意配撘
今次就把一支m42 135mm f2.8鏡頭
裏的鏡片除下自己做了個
M55轉m57接就完成一支真正相机鏡頭
可惜光葉位置和尺寸不好收光圈後有黑圈
Borg 71 FL變成支有光圈鏡頭
Borg 71 FL變成支有光圈鏡頭
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- 註冊時間: 週四 09 10月, 2003 21:06
The aperture stop must be added at the ENTRANCE PUPIL of the optical system otherwise you will have serious vignetting.
For refracting telescope the entrance pupil is always at the front element of the objective lens. Hence what you should do is to install the aperture blades at the front but not the back of the telescope. However you need a very big aperture stop, same size as the aperture of telescope.
For refracting telescope the entrance pupil is always at the front element of the objective lens. Hence what you should do is to install the aperture blades at the front but not the back of the telescope. However you need a very big aperture stop, same size as the aperture of telescope.
但Borg原厰也有在鏡後的光葉,不知是否我現在光葉位置不對而出問題Chanlunlun 寫:The aperture stop must be added at the ENTRANCE PUPIL of the optical system otherwise you will have serious vignetting.
For refracting telescope the entrance pupil is always at the front element of the objective lens. Hence what you should do is to install the aperture blades at the front but not the back of the telescope. However you need a very big aperture stop, same size as the aperture of telescope.
因現有的鏡頭光葉也在鏡裏
應是位置不對請問是否有計算方式找出光葉位置
至於鄧sir説的平場减焦和濾片庒也準備了
就是我找到光葉位置就可安装上去
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That is only for small chip CCD ( actually very small chip ) where vigneting is not a serious problem ( still a problem).kwong 寫:但Borg原厰也有在鏡後的光葉,不知是否我現在光葉位置不對而出問題Chanlunlun 寫:The aperture stop must be added at the ENTRANCE PUPIL of the optical system otherwise you will have serious vignetting.
For refracting telescope the entrance pupil is always at the front element of the objective lens. Hence what you should do is to install the aperture blades at the front but not the back of the telescope. However you need a very big aperture stop, same size as the aperture of telescope.
因現有的鏡頭光葉也在鏡裏
For full frame chip ( or relative bigger chip ) aperture blade must be installed at entrance pupil to avoid vignetting. If the aperture blade is too close to the focal plate it becomes a field limiter instead of an aperture stop. That's why you see a circle.
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