[天下無敵]

我無用過增距境,如果一支200 f2.8既鏡,用上一個2x既增距境.

甘光圈會變成幾多?係機上有無顯示出來?
拍出來既相片同400mm 既焦距有無好大分別?

用5d拍出來,曬到a4甘有無咩大問題?

同埋增距境入面有無咩特別既鏡片?定係咩鏡片都無?

[pingu_hk]

1.4x extender f2.8 ---> f4.0 focal length 200mm --> 280 mm
2.0x extender f2.8 ---> f5.6 focal length 200mm --> 400 mm

extender is designed for FIXED focal length lens, if using on ZOOM, quality drops rapidly, CA comes out all over the corners

sometimes u can use a 200 mm lens, crop the middle portion, enlarge with PS, the result is sometimes better than the 200 mm with 2x extender.

ONE REASON TO USE EXTENDER IS THE NARROW depth of field.