i like all the birds awesome . how do u use the extender ? i have aplan to buy f4 or f/2.8 but i really confused which one do i get . if you dont mind would you tell me the f/4 combine with the exteder picture quality ?i am currently using 17-40 f/4 . if you use wedding lens what kind of lens do u prefer . if u drop me one line i would really apprecaite it.
