超廣角鏡 發表於 2013-7-18 12:48:04

有關微距拍攝問題

如果用一支非微距鏡拍攝皮腔比在無限遠時申延了一倍，這樣子我應該加大多少級光圈呢？有沒有方程式計出來的？請指教。:smile:

AMPL 發表於 2013-7-18 15:38:10

2級掛？！

AMPL 發表於 2013-7-18 15:43:13

http://people.umass.edu/~rbhome/bellows15.pdf

http://www.ndavidking.com/Tech%20Articles/Bellow%20Factor%20Illustration.pdf

http://www.cookseytalbottgallery.com/bellows_compensation.php

超廣角鏡 發表於 2013-7-18 17:56:12

AMPL 發表於 2013-7-18 03:43 PM static/image/common/back.gif
http://people.umass.edu/~rbhome/bellows15.pdf

http://www.ndavidking.com/Tech%20Articles/Bellow%20 ...

謝謝，小弟死蠢計唔明.....:dizzy:

michael1015 發表於 2013-7-18 20:07:13

記得係物距離鏡頭少於 focal length 8X 就要 exposure compensation，條 formula 係 exposure value x actual bellow length/focal length of lens .............

example:
Exposure value = F8
Actual bellow length = 300mm
Focal length of lens = 150mm

F8 x 300mm/150mm =F16

That means +2EV when bellow length is 300mm if focal length is 150mm.

michael1015 發表於 2013-7-18 20:09:40

係咪應該話加多幾多曝光時間呢？再加大光圈個景深勁淺呢 .............. 可能 cover 唔晒主體噃 ...........

超廣角鏡 發表於 2013-7-19 00:15:46

michael1015 發表於 2013-7-18 08:07 PM static/image/common/back.gif
記得係物距離鏡頭少於 focal length 8X 就要 exposure compensation，條 formula 係 exposure value x actu ...

明白晒，謝謝MICHAEL哥！:biggrin:

超廣角鏡 發表於 2013-7-19 00:16:54

michael1015 發表於 2013-7-18 08:09 PM static/image/common/back.gif
係咪應該話加多幾多曝光時間呢？再加大光圈個景深勁淺呢 .............. 可能 cover 唔晒主體噃 .... ...

係係係！多謝指教。:good:
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