[pilz_e]

佢指光圈降低一級,一級為多少? F 1.0?

[bb1032003]

One stop means, if the 'correct' exposure is eg. iso 100, f8, 1/200" then after you use extension tube the 'correct' exposure will be iso 100, f5.6, 1/200"

One stop is like this,

2.8, 4, 5.6, 8, 11 etc

[yung2]

f.? x 2 = 一級

例如： f1.4 => f2.8 => f5.6 =>f11

[micros]

1 級係 2 o既開方。
http://content.edu.tw/vocation/art/ks_hc/htm/content/ch17/New_Pages/operation_4_1.html

[pongyee]

一般商業生產的民用鏡的光圈，用以下的數字作一級遞增：

1.0 > 1.4 > 2.0 > 2.8 > 4.0 > 5.6 > 8.0 > 11 > 16 > 22 > 32 > 45