The two are almost the same. There are many people to shoot in LZ, so a large aperture is necessary. Go directly to 50 1.4. The difference between the two is not only the aperture, but also the imaging and sharpness. Jiao Wai is worse. 50 18 is an excessive product. The manual training is not bad and the price is very cheap, but it is not recommended by those who have requirements. However, the latter 16-85 imaging is better than 18- 105. Suggestion 16-85+50 1.4.