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I assume you want to be able to use movie servo without stuttering, twitching or noise? Then a STM lens like the 18-135 is the way to go. If you prefocus your clips or use MF, then if doesn't matter and you can use any lens that suits your needs. I often use the EF-s 15-85 3.5-5.6 IS USM on my 70D and it's the only USM zoom I know of that's silent to onboard mics and doesn't stutter. It's surprisingly smooth during movie servo but is a bit fast if you're into focus pulls.
I also have the EF 40 2.8 STM and, while it's very smooth, the 70D mics pick it up during AF. Of course, you could use outboard audio or an external mics to get around the AF noise. The 18-55 STM works well--silent to onboard mics and smooth during servo--but I don't care for the cheap feel and small zoom range.
If you're shooting video on a tripod, IS is normally turned off.
All of my recent videos--the past year--on my YouTube channel were shot with the 70D and 15-85. Movie servo is extremely smooth and it never twitches or jerks, unlike the other USM lenses I've tried.
https://www.youtube.com/c/PeterFrary/
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