在长期摄影工作中，我对变焦镜头颇有好感。变焦镜头与定焦镜头比较从理论上讲应该是一分为二，各有所长也各有不足。定焦镜头其成像质量、透光度、清晰度应该说好于同焦距同档次的变焦头，但最大缺点一是出门时一种焦距镜头不够用、带多了又不方便，二是不便于摄影师技巧... In the long-term photography work, I am quite good on the zoom lens. Zoom lens and fixed-focus lens in theory should be divided into two, each has its own strengths and weaknesses. Fixed-focus lens imaging quality, transparency, clarity should be said to be better than the same focal length with the zoom head, but the biggest drawback is a lens out of focus when not enough, with more inconvenient, and the second is inconvenient Photographer Tips ...