[jackywong6288]

我星期六在深水埗瑩記買左一個G9用的增距鏡 2x，返到屋企用電腦開相片先知道吾係放大2倍，而係放大左大約1.5倍，到底係吾係我理解錯增距鏡的放大比率.......

如果係增距鏡 2x 錯左，有無得換返.........

[Obi-Wan]

2X converter should double the focal length, so the "height" and "width" of the object should be doubled, e.g. a 200mm should behave as a 400mm lens

[jackywong6288]

thx obi-wan ching,
我應該係問錯問題，焦距放大2倍是否=相片都一起放大2倍？

[Obi-Wan]

please go check the photos in this site
http://en.wikipedia.org/wiki/Teleconverter
u should notice that the height of the tower on the right in the picture has been doubled by a 2X converter