The jig to do it is somewhat expensive it and hard to put together. The especially hard part is getting the lens to not vibrate at higher speeds, which is proba

The jig to do it is somewhat expensive it and hard to put together. The especially hard part is getting the lens to not vibrate at higher speeds, which is probably done by using pneumatic or hydraulic drive or very strong magnetic drive. And if the thing goes off, you could have tens of kilos of broken glass flying in all directions.