Yes.

来源: pieq314 于 2007-01-13 18:23:28 [] [旧帖] [给我悄悄话] 阅读数 : 0 (221 bytes)

There is no free lunch.

1. The lens image quality will decrease.

2. The f # will increase. For example, if you have a lens with f/2.8 and you use a 2x teleconverter on it, it will become a f/5.8 lens.

所有跟帖： 

• That's why nobody mentioned it. Thanks! -sqllsq- ♂ 给 sqllsq 发送悄悄话 (0 bytes) () 01/13/2007 postreply 18:27:09

请您先登陆，再发跟帖！