镜头比相机更重要, 引用行家的一句话.....

Does buying a really good lens make that big a difference in sharpness? Absolutely!

A quality lens is an investment, and as long as you take decent care of it, it will give you crystal clear photos that inexpensive lenses just can't deliver.
很多新手往往首先将注意力集中在相机上，而不在乎镜头,有点本末倒置。
打个比方，一视力很好的人，带了一幅dollar 店买的塑料墨镜，效果如何可想而知！