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#aperture

Drpd menyumpahi lampu mati, sy kultwit singkat tentang #aperture/diafragma dlm fotografi.

Dlm fotografi, #aperture menunjukkan brp banyak cahaya msk ke dlm kamera/sensor, ini bs diatur.

Makin byk cahaya diterima sensor: kecepatan rana/shutter speed makin cepat tp depth of field makin sempit. #aperture

Shutter speed: makin cepat makin bisa membekukan objek bergerak. DoF: makin sempit makin kecil ruang fokus dlm foto. #aperture

Dlm kamera, mode “A” menunjukkan #aperture priority. Artinya kita ngatur brp byk cahaya msk, sedangkan kamera menghitung speed scr otomatis.

Note utk mode A: ceteris paribus, all things hold equal (ISO, exposure variation). #aperture

Gmn kita tau brp byk cahaya msk? Liat angka f yg ada di lcd kamera/lensa. Makin kecil f makin byk cahaya yg msk. #aperture

Salah satu ukuran kualitas sebuah lensa ada pd bukaan #aperture-nya. Makin besar diafragma yg bisa “dibuka”, lensa biasanya makin mahal.

Lensa kit biasanya max #aperture f 3.5 (widest) – 5.6 (longest focal length): makin wide makin lebar bukaannya.

Setau saya, lensa dg #aperture paling lebar adl Leica Noctilux 50mm F 0.95 yg harganya sekitar $12.000 atau Rp108 juta 😦

Umumnya sebuah lensa punya rentang #aperture (kyk tadi 3.5-5.6). Tp lensa yg mahal aperturenya bs fixed (misal lensa 24-70mm f2.8).

Utk lensa zoom, makin wide lensa itu makin susah, secara teknis, membuat #aperture yg fixed.

Contoh: lensa olympus zuiko digital 14-35 punya #aperture f2 (fixed). Lensa ini mahalll (walau ga semahal leica noctilux td).

Di kebanyakan lensa saat ini, pengaturan bukaan diafragma dilakukan via kamera. Pd lensa2 jadul ngaturnya via #aperture ring yg ada d lensa.

Baiklah berhubung lampu udah bangkit dr kubur maka kultwit #aperture ini saya hentikan. Semoga tweeps bosan setengah hidup. Selamat surup.

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Categories: Fotografi
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  1. November 27, 2012 at 1:31 am

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