Photographers shoot videos in Tibetan.

Your question is really confusing. For the novice, the head of the team is right. It is most convenient to travel around the world with a mirror. It can be said that when making a movie in Tibet, all the focal segments of wide-angle medium focus and telephoto can be used. But you already have a 18- 105. It's a little wasteful to buy another 18-200. Let me talk about my ideas for your reference.

1. If you just want to be an amateur, you don't plan to invest more in the future. You can sell 18- 105 and buy 18-200. It is very convenient to use.

2. If you want to change the fuselage and further develop photography in the future, buy 70-200. This time, you should take 18- 105 and 70-200 with you. It may be a little inconvenient to travel, but it's a good thing that the photography team should have time to change the lens.

If conditions permit, it is best to bring more than 2 fuselage. Telephoto and wide angle are more convenient to use.

Mind you, you can also bring an original fully manual film camera, such as FM2. Some digital cameras have altitude sickness, which happened to more than one friend. It is almost impossible to take manual gear insurance. After all, it is not easy to go to Tibet.