Basically for my next project I wanted to do some zooms and dolly zooms for some of the shots, to get a certain effect, but then discovered it may not be a possibly, cause the lenses we have access to are not parfocal. However, I watched this film riot video, and at 4:33 into the video, the lens that they zoom on, is a Canon 24-105mm.

This is one of the lenses we could get access to. We asked the shop and they said it was not parfocal. I also asked B & H to be sure, and they also said it was not parfocal. However, in the video, when they zoom in on the lens, they somehow manage to do it in a parfocal way, since the camera stays in focus during the zoom. How did they manage to do that on a lens that is not parfocal, I was wondering?

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