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Post Tinjauan Matematis Diafragma sebuah Lensa - 22-09-2005, 01:30

Diafragma merupakan suatu nilai bukaan lensa yang biasa dilambangkan dengan f stops. Pada awalnya diafragma lensa merupakan suatu lembaran kertas yang diberikan lubang ditengahnya yang berfungsi untuk menghentikan cahaya. Oleh karena itu sebutan untuk diafragma adalah stop yang berarti menghentikan.
Untuk menambah cahaya masuk, maka kertas tadi diganti dengan kertas yang mempunyai lubang yang lebih besar. Begitu juga jika ingin mengurangi cahaya yang masuk, kertas diganti dengan kertas yang mempunyai lubang yang lebih kecil.

Diafragma (f) merupakan perbandingan antara panjang fokal lensa (F) dengan diameter bukaan lensa (D).

f = F/D

Contoh: jika lensa 50mm (panjang fokal) mempunyai diameter bukaan selebar 25mm, maka f-stops nya adalah:

f = 50 mm/ 25mm = 2.0

[img]file:///D:/Diktat%20Fotografi/diafragma%201.jpg[/img]

[img]file:///D:/Diktat%20Fotografi/diafragma%202.jpg[/img]

[img]file:///D:/Diktat%20Fotografi/diafragma%203.jpg[/img]

[img]file:///D:/Diktat%20Fotografi/diafragma%204.jpg[/img]


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Re: Tinjauan Matematis Diafragma sebuah Lensa - 22-09-2005, 15:30

lumayann..
tapi gambarnya jangan di link ke local computer dunk
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Re: Tinjauan Matematis Diafragma sebuah Lensa - 28-09-2005, 17:46

OOT mas the_catz, kalo chip forum kgk bisa pake IMG...mesti host dulu pic nya ke 3rd party seperti imageshack baru di link ke thread nya...semoga membantu



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Re: Tinjauan Matematis Diafragma sebuah Lensa - 29-09-2005, 07:58

Quote:
Originally Posted by maverick_007
OOT mas the_catz, kalo chip forum kgk bisa pake IMG...mesti host dulu pic nya ke 3rd party seperti imageshack baru di link ke thread nya...semoga membantu
mungkin maksudnya bukan gak isa IMG tapi gak isa attach file.
kalo punya gambar mending upload dolo di site spt yg mavrck bilang imagesack atau photobucket.com.
btw.. thread nya lanjutkan dunkk !!
mau tau nehh.. perhitungan matematisnya secara detail.
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