Canon EOS 850D + EF-S 18-135mm f/3.5-5.6 IS STM Lens
As video has made a major reentry into our lives, (we couldn't give away a camcorder 5 years ago) Canon has put a major effort into silent focus motors. The result is the STM range of lenses of which this 18-135mm STM (not USM Lens) is one of them. The USM is faster BUT the STM is silent which means you will not get any focus motor noise on your audio.
See the Details Tab for a more detailed explanation as to why the STM version of the 18-135mm could be the right choice for your needs.