[Wahdong]

Q1. ISO的英文全寫是什麼?

Q2. 唔係ISO 值越低像的質素越好嗎? 點解會有人希望ISO 值超過400? ISO 值高有什麼好處?

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我係初哥, 請多多指教.

[andy3210]

International Standard Organization

[wkcjacky]

ISO 9001~!?

[wtfgary]

Q1. ISO的英文全寫是什麼?
I don't know, but I think andy3210 is right.

Q2. 唔係ISO 值越低像的質素越好嗎? 點解會有人希望ISO 值超過400? ISO 值高有什麼好處?

Higher the ISO, higher the light sensitivity. Hence, higher ISO can be used in low light + fast shutter situation. (eg. Good for Entertainment reporter to shoot some famous people at night)

[Wahdong]

明白, 多謝andy哥 & gary哥

[小班長ErikoB]

吓....相機 ge iso同 International Standard Organization 係一樣 ga mei???
相機 ge係 film 感光速度 owr.咁樣解法真係有d怪....

[kkkleung]

Film speed is the measure of a photographic film stock's sensitivity to light. Stock with lower sensitivity requires a longer exposure and is thus called a slow film, while stock with higher sensitivity can shoot the same scene with a shorter exposure and is called a fast film.

The standard known as ISO 5800:1987 from the International Organization for Standardization (ISO) defines both a linear scale and a logarithmic scale for measuring film speed.

In the ISO linear scale, which corresponds to the older ASA scale, doubling the speed of a film (that is, halving the amount of light that is necessary to expose the film) implies doubling the numeric value that designates the film speed. In the ISO logarithmic scale, which corresponds to the older DIN scale, doubling the speed of a film implies adding 3° to the numeric value that designates the film speed. For example, a film rated ISO 200/24° is twice as sensitive as a film rated ISO 100/21°.

The most common ISO film ratings are 25/15°, 50/18°, 100/21°, 200/24°, 400/27°, 800/30°, 1600/33°, and 3200/36°. Consumer films are generally rated between 100/21° and 800/30°, inclusive.

Refer to:
http://en.wikipedia.org/wiki/Film_speed

[micros]

菲林速度都要有定義﹐唔係就好煩﹐唔同地方唔同廠用唔同 standard ﹐就唔能夠相容。
ISO 係 International Standards Organization ﹐而菲林O既 ISO 就係呢個機構下o既定義﹐俗稱亦係 ISO。
ISO 結合O左唔同 STANDARD o既定義﹐分別係 ASA 同 DIN。
http://www.kodak.com/global/en/consumer/glossary/termsG_J.shtml
http://www.internetcamera.it/photohelp-iso_asa_din.asp

較低 iso 通常有較佳畫質﹐菲林同數碼都係。
高 iso 亦有其用途﹐例如係暗黑環境中取得較高快門。

[baroque]

http://www.minoxlab.com/Don_Krehbiel/mpl/dkasa.htm

[MN56]

The orginal name of ISO is "International Organisation for Standardisation".