If you don't want to spend too much money on high-end lenses, it is necessary to buy a high-power lamp first (of course, a third party with higher power can also be used, but it is not convenient to use the original factory). If there is no light for indoor live broadcast, any lens is useless. If you need to shoot in shallow depth of field, you can enter 50 1.4 or 851.8 (both 50 and 85 are a little long and cannot be used indoors. If it is used outdoors, it is recommended that 85) For those fast photos with shallow depth of field and beautiful, most of them are made in 70 200 L, so don't expect too much from the lenses of 501.4,851.8. Although the focus is fixed, the price of 1.7 million, that is, 70,200 (Xiaobai), is not for nothing.