Sigma 30mm F1.4 定 canon 50mm f1,4好 ?

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.镜头分类标准变焦镜头超广角变焦镜头远摄变焦镜头超广角及广角镜头标准至中距镜头远摄及超远摄镜头微距镜头移轴镜头增距配接镜

适马30 1.4有几种版本

不考虑卡口的话 有2个版本 一个是ART系的 另一个就是旧版了