[tommy0811]

睇左唔同網站既介紹, 好多都放將當前可調既最大光圈縮少1~3級就係最佳光圈。

例如2.8既就係f8~F11到。 2.8x3=8.4, 所以咁樣用8? 咁f11條數又點計呢？

如果我有支鏡係3.5,咁係咪應該三級既就 3.5x3=11? 2級就 3.5x2 =7?

[francisgamer]

光圈一級係1.4.

2.8>4.0>5.6>8.0>11>16

上面一格係一級.

所以你話2.8收3級係8
3.5既3級係9.6

[tommy0811]

ching唔該哂。 咁如果f1.4係最大，咁係咪= 1.4 x 2.83= 3.96,所以最佳光圈=4?

[chongsiucheong]

The best aperture of each lens is different.

May I introduce a wed-site to you, there are many lens test in different aperture.

for e.g. Canon EF 10-22, they test in every focal length with details data.

http://www.photozone.de/canon-eos/406-canon_1022_3545_50d?start=1

Merry Christmas!

[siubi09]

別太執著最佳光圈, 影到自己想要既野比較緊要

當然最佳光圈好重要, 但別太執著, 下下用F9-11, 點影散景....

[tommy0811]

唔該哂咁多位ching

[MN56]

對於反射鏡或天文鏡，default就已經係最佳 (diffraction limited)。