Because you never used a follow focus. You use the hard stops to set the limit of the entire focus range: Closest and furthest the lens will focus so it won’t keep turning. (Canon EF lenses can turn forever)
Then the there is a white ring you can mark with a dry erase marker to mark your focus points. It is how we do it in Hollywood on big million dollar productions. They don’t use the hard stops to mark the actors.
On a real cine lens, the lens can’t turn past either extreme (close, far) Canon EF lenses have an infinite turning focus ring so you need to put a hard stop at both extreme points so it won’t turn beyond either point.
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