✔ 最佳答案
你本身有甚麼鏡頭呢?你講既係Canon好出名既大三元其中兩支,畫質絶對唔駛懷疑.但係400D有1.6倍焦距增長,淨係得24-70 mm f2.8L USM的話,最廣角焦距變咗38.4 mm.唔係好夠廣角.咁睇來16-35 mm f2.8L USM會較好.
其實如果你冇打算短期內升級更大片幅感光完件的相機,我覺得唔一定要用到咁頂級鏡頭,一來貴,二來重,三來嘥咗好難先做得好既邊位解像度.不如平小小買EFS 17-55 mm f2.8 mm IS USM仲合襯,又方便,畫質都唔會差好遠.
以下是三支鏡的review
16-35 mm f2.8L (第一代)
http://www.photozone.de/8Reviews/lenses/canon_1635_28/index.htm
24-70 mm f2.8L
http://www.photozone.de/8Reviews/lenses/canon_2470_28/index.htm
17-55 mm f2.8 IS
http://www.photozone.de/8Reviews/lenses/canon_1755_28/index.htm