-If I want to use the lens on a tripod together, I prefer a household rubber (or rubber ring for mason jars) in addition to the ring for zooming. Having detects the subject, I push the zoom rubber ring toward zooming ring.
Despite rubber I still have plenty of space around the focus (if necessary) set manually. Even when running the tube runs out no more. It looks not stylish, but in my opinion is the functionality in the first place. In old "ausgenudelten" lenses I do that as well;)
Conclusion:
+ Value for money
+ Zoom range
+ Sharp images
+ Little vignetting
+ Good and fast for the price range autofocus
+ Focussierring for manual focus is centered, benefit in using filters
- Tube runs from alone out when camera is held vertically, problem can be easily and quickly fix
---> Who wants to buy a daily lens for relatively little money, is well advised with this Canon lens.