Sigma 30mm F1.4 定 canon 50mm f1,4好 ?

Sigma 30mm and Canon50mm is for film or digital?For digital camera, due the the CCD/CMOS size is smaller than film, it needs to mulitply with 1.5x to the mm value. That means a 50mm lens use in a digital camera similar to 75mm in film camera.For 人像 50 to 90mm is suitable range, so both seems ok.F1.4 lens is a very goods lens and seldom use in general cumer range.General cumer most range from f2.0 to f4.5For same quality lens, canon are more expensive due to the Brand effect.Yon can have more lens infromation by visit the following site.鏡頭分類標準變焦鏡頭超廣角變焦鏡頭遠攝變焦鏡頭超廣角及廣角鏡頭標準至中距鏡頭遠攝及超遠攝鏡頭微距鏡頭移軸鏡頭增距配接鏡

適馬30 1.4有幾種版本

不考慮卡口的話 有2個版本 一個是ART系的 另一個就是舊版了